* Improve the implementation mechanism of queue mode. #96

* refactor the code .

* add Copyright & License description into header text of code files.

* refactor

* set version to 2.2.0

* update unit tests.

* add exception class to process the publish send and subscriber exectution exception

* modify first retry time to three.

* code refactor.

* add retry mechanism

* code refactor

* refactor consumer execution

* fix spell error

* remove dashboard  `processing ` content.

* Modify the retry to retry the message only 4 minutes ago.

* update samples

* update ci configuration.

* add dashboard branch.

* add dashboard

* add helper methods.

* Add data model.

* add options.

* add empty implement

* add dashbaord

* add dashboard

* Fixed spelling error

* rename file.

* add dashbaord feature

* impl dashboard storage

* update nuget reference.

* add pages.

* deleted unused fiels.

* modify resource.

* update resource.

* rename

* update dashboard

* rename

* impl monitoring api interface.

* update solution files.

* update samples.

* dashboard.

* add jsonview resource files.

* add json dispatcher.

* modify published pages.

* add routes.

* update pages.

* update resources.

* update dashboard.

* add dashboard of sql server storage impl

* nesting files.

* fixed query bug.

* update resource.

* remove some api.

* add subscriber page.

* update sample

* add resource.

* remove api.

* add SubscriberPage

* add resource

* generate cshtml.

* modify html two table to one table.

* update resource.

* update css

* update subscriber page.

* refactor.

* cleanup.

* cleanup code.

* impl history monitoring api.

* add home page recevied message real-time

* add legend styles.

* update js.

* modify axis color.

* add resource.

* update dashboard home page.

* update css.

* update resource.

* modify DefaultSucceedMessageExpirationAfter to 24 hours.

* add resx,

* add consul discovery.

* remove unused file.

* add node page.

* add node page

* node discovery

* add kafka sqlserver sample.

* update sample.

* add okstats.

* refactor.

* fixed kafka client bugs.

* modify node and subscriber pages

* refactor.

* add Gateway middleware

* remove unused files.

* update resource.

* update gateway.

* refactor.

* update samples.

* remove base middleware

* add node switch click event.

* add NodeId config to options.

* upgrade dependent version.

* add PathMatch configuration

* update NodePage.cshtml

* remove session

* remove matchPath

* refactor

* refactor dashboard middleware

* gateway proxy middleware function maturation

* remove cookie exp

* refactor and remove files.

* add CapCache to cache server nodes.

* refactor.

* renamed message dto.

* add extended interface of IContentSerializer and JsonContentSerializer

* modify unit test

* check the requirement when CAP start.

* correct spelling

* cleanup code.

* add resources.

* processing pages will contains  Scheduled  and Enqueued messages.

* processing pages will contains  Scheduled  and Enqueued messages.

* ignore NU1701 Warning.

* renamed file.

* refactor

* implements dashboard interface.

* rename reference class.

* add mysql monitoring api impl

* fix bug of connection driver.

* remove cap.UseDashboard.  It's will be automatically enabled by registerd services.

* fix sql bug

* cleanup code and fix spelling

* fix postgre sql bug.

* fix mysql sql bug.

* when storage a received message raising an eception, we will reject the message to queue.

* fix spelling mistake

* add dashboard instructions to readme

* modify error log content.

* fix postger sql bug.

* fix consul discovery bug.

* add dashboard introduction to readme.md

* update english resource.

* Update README.md

* renamed files.

* fix postgre sql bug.

* cleanup code.

* update tests.

* rename file.

* update samples.

* Improved query performance without lock table. (#36)

* update sample.

* update samples.

* fix data reader uncolsed bug.

* update add jsonproperty

* refactor

* revert FetchNextMessageAsync sql

* add helper method.

* rafactor subscriber handler.

* add FailedRetryCount options.

* rafactor publisher excutor.

* add IPublishExecutor

* add failed message processor.

* inject failed message processor.

* refactor sql storage.

* fixed unit tests.

* fixed unit test.

* fixed postgresql tests.

* Update .travis.yml

* Update .travis.yml

* Update .travis.yml

* Update .travis.yml

* Update .travis.yml

* Update .travis.yml

* Update .travis.yml

* Update .travis.yml

* Update .travis.yml

* Update .travis.yml

* Update .travis.yml

* add LAN ip to LocalRequestsOnlyAuthorizationFilter

* add and update resource.

* add current node name to layout page if user enabled node discovery

* modify unit tests.

* add callback message sende tests.

* add deserlizer by type to  IContentSerializer

* refactor unit tests

* add summary comment.

* refactor async method.

* add comment and fixed spell error.

* refactor.

* add custom content serializer extension to CapBuilder

* add IMessagePacker

* refactor.

* add connection pool for kafka producer.

* add determines whether the query is null.

* add connection pool size config to KafkaOption.

* fixed json JObject bug

* add custom message wapper interface

* remove unused code.

* fixed callback topic send error bug.

* refactor.

* update unit tests.

* update samples.

* upgrade dependent package.

* remove some class from Abstraction namespce to Internal.

* optimize consumer related code

* add ICallbackMessageSender to DI with singleton.

* add and fixed some unit tests.

* refactor namespace.

* modify class protected level

* assemblies internal class are visible to test project

* add DeSerialize method to IContentSerializer with type deseralize

* refactoring

* Fix the phone style dispaly problem

* add logs

* refactoring

* upgrading `Confluent.Kafka` package

* Optimize message queue error message prompt.

* reorganize error message prompts.

* modify error message prompt

* add summary comments.

* modify dependent

* disabled print connection closed log. see: https://github.com/edenhill/librdkafka/issues/516

* Update README.md

* Update README.md

* Update README.zh-cn.md

* Update README.zh-cn.md

* fix dashboard not config discovery throw exceptions bug.

* Update README.md

* update readme

* Fixed serialized the message type bug. (#53)

* Update README.md

* Update README.md

* refactoring

* refactoring

* update readme.

* update readme.

* add summary comment.

* refactoring

* optimizing publisher interface

* update readme

* update readme.

* add summary comment.

* add summary comment.

* add summary comment.

* add summary comment.

* upgrading package

* add summary comment.

* optimize the RabbitMQ connection pool

* fix the producer connection returned

* dispose resource when connection pool is full