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

Conflicts:
	eZ/Bundle/EzPublishCoreBundle/Resources/config/fieldtypes.yml
EZP-21191: implemented REST RichText field type processor
EZP-21191: registered ezrichtext search field
EZP-21191: fixed converter and external storage gateway settings
EZP-21191: fixed RichText yml configuration
EZP-21191: fixed HTML5 CoreBundle converters
EZP-21191: fixed twig filters
EZP-21191: fixed configuration parsing
EZP-21191: fixed test template
EZP-21191: temporarily disabled default value from storage (cache issues)
EZP-21191: removed passing DOMDocument between BL and storage
EZP-21191: RichText stores its own internal format
EZP-21191: fixed CS
EZP-21191: move ezxml conversion and tests to Core/FieldType
EZP-21191: extract base gateway class
EZP-21191: ezxml: text nodes in table cells must be wraped in paragraph
EZP-21191: a way to test lossy conversion