WIP (#285)

* update version to 2.4.0

* Add version options to config file.

* update resource

* add  message version support  for dashboard

* add  message version support  for dashboard

* Support using version to isolate messages. #220

* update mongo unit tests

* update unit tests

* update unit tests

* Set default versions for consumer groups

* solve the problem of issue#181 (#237)

* Issue#235 (#238)

* solve the problem of issue#181

* solve the problem of issue#235

* refactor

* Fix the message persistence bug. #240

* using new CamelCaseNamingStrategy

* update packages to .net core 2.2

* update test framework to netcoreapp2.2

* Update .travis.yml

* update TargetFramework

* Exclude build samples project

* update version to 2.4.1

* add samples project to sln for build

* update version to 2.4.2

* Fixed PostgreSql version isolation feature bug. (#256)

* Fixed spelling errors

* modify cap publish Message to rabbitmq slow (#261)

* Startup the CAP with the BackgroundService.  #265

* update samples

* Fixed SQL query bug. #266

* update travis ci config

* update travis ci config

* adjust dashboard table column width

* adjust the consumer execution time to milliseconds

* update ignore

* add mkdocs.yml

* update version to 2.4.3

* add about.md docs

* add index.md docs

* add docs

* add docs

* add docs

* add docs

* add docs

* add docs

* add docs

* add docs

* add docs

* add docs

* add docs

* Fix resource files

* add docs

* add docs

* add docs

* Create readme.md

* add markdown extensions supports

* update about.md

* add CNAME fiel

* add img

* update docs

* Update README.zh-cn.md