Merge pull request #2 from flaviusx/master

CURRIKI-6045 : Enable JsSkinFileExtensionPlugin entry point and start migrating to syntax 2.0.
Thank you Flavius.
paul
misc: build fixes to refer to proper modified plugins. Fixed platform activity stream version to 3.5.1 instead of snapshot
Merge pull request #3 from flaviusx/master

Javascript validations reworked for SimpleWikiResource and SimpleHTMLResource.
This is part of CURRIKI-6056.
Thank you Flavius
paul