EZP-21191: enable string 'null' as null value alias
EZP-21191: implemented HTML5 edit test bundle
Implemented EZP-21317: Create XML schema for XHTML5 input

Conflicts:
	eZ/Bundle/EzPublishCoreBundle/Resources/config/fieldtypes.yml
EZP-21191: RichText field type initial implementation
Merge pull request #665 from ezsystems/implement-EZP-21191-richtext

EZP-21191: RichText field type