CURRIKI-6045 : Enable JsSkinFileExtensionPlugin entry point

Enabled the jsfx entry point. It is required by helper macros for
loading the wysiwyg editor.
CURRIKI-4029 : PROJECT: New Wiki Editor

Converted SimpleWikiResource and SimpleHTMLResource to syntax xwiki/2.0
and added the new wysiwyg editor.
Merge pull request #2 from flaviusx/master

CURRIKI-6045 : Enable JsSkinFileExtensionPlugin entry point and start migrating to syntax 2.0.
Thank you Flavius.
paul