Work in progress on W3C incorporation.
Merge branch 'feature/ui_rework' of ssh://github.com/structr/structr into feature/ui_rework

Conflicts:
	structr-ui/src/main/java/org/structr/web/entity/Content.java
	structr-ui/src/main/java/org/structr/web/entity/Page.java
Work in progress.
Merge branch 'feature/ui_rework' of ssh://github.com/structr/structr into feature/ui_rework