Fix links to Google Groups in README.md

Fixes typo in link title (CSM --> CMS)
Does not force the Google Groups interface language to Italian
updated CHANGELOG
Merge remote-tracking branch 'upstream/master'
Fixed BC break

Introducted in 177f5534f0e93567b473628698ac90d83551396b when 'data-texteditor-cfg' was introduced
Merge pull request #56 from bvleur/fix-readme

Fix links to Google Groups in README.md
rewritten the menu to add blocks

Sometimes it could have happen the menu to add blocks was not correctly rendered. For that reason the responsibility
to build the groups of blocks for each list in that menu, has been delegated to the new BlocksAdderMenu object.
Merge pull request #58 from janxin/master

Rewritten the menu to add blocks
markdown editor options moved to default
updated MarkownBlockBundle dependencies; added phpunit configuration file; added bootstrap file to run tests
updated composer dependencies in UPGRADE-TO-REDKITE-CMS-1-1-3.md
updated CHANGELOG
Merge pull request #59 from janxin/master

MarkdownBundle improvements