* Update docs for alpha release

* Delete a comma.

* Update How-to-build.md

* Add data-set licenses file

* Rename LICENSES-data-set to LICENSE-data-set

* Update LICENSE

* Remove fastclick from LICENSE

* Make the git submodule command to be a maven profile plugin. Let this command not execute by default install command.

* [maven-release-plugin] prepare release apm-5.0.0-alpha

* [maven-release-plugin] prepare for next development iteration

* Product name is not correct

* Add more documents for release.

* Change profile id.

* Add CHANGES file in distribution file.

* Revert "[maven-release-plugin] prepare for next development iteration"

This reverts commit ac815019.

* Revert "[maven-release-plugin] prepare release apm-5.0.0-alpha"

This reverts commit 095597c9.

* Add rat plugin to check dependency license and add license head into missing files.

* Fix docs.

* Exclude web ui config file.

* Next release guide.

* UI update.

* Update docs.

* Build source shell.

Fixing javadoc. And try to trigger a ci fail in this commit, in order to make sure javadoc will be checked in further pull request.

So change coverage tools from Cobertura to JaCoCo

* add plugins for resin-3.x and resin-4.x 

fix the image name of collector issue and push docker images when skywalking is tagged and the branch is master

fix the image name of collector issue and push docker images when skywalking is tagged and the branch is master

1.remove webui useless demo.  2. solve webui compile issue. 3. remove old test case, waiting test scenario by docker tech. @ascrutae