Merge pull request #4934 from ricardoquesada/changelog_fixes

Adds release date to CHANGELOG
Adds RELEASE_NOTES.md to repo
Adds TOC
Removes RELASE_NOTES
misc changes
Tables fixes

Since markdown doesn't support  tables, it is using
"fended" blocks to simulate tables
minor fixes with the information
Remove useless samples
Merge pull request #4937 from ricardoquesada/relase_notes

Relase notes
Fix:Resolve the release lua test sample compile error
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-x into developNewUI
Merge branch 'develop' into develop_nutty_modify_framework_removeuselesssample
Merge pull request #4939 from nutty898/develop_nutty_modify_framework_removeuselesssample

Develop nutty modify framework removeuselesssample
Merge pull request #4941 from samuele3hu/developNewUI

Fix:Resolve the release version of lua test sample compile error