css: removed generator fragment and generated files
trac #210: added doc for font properties
fixed trac #309
trac #310: implemented duplicate property filtering, now a property is
only proposed, if it is not already used within the given selector
renamed proposal provider to match xtext generator expected name
cleanup: removed old extension api
Merge branch 'master' of git@github.com:tomsontom/e-fx-clipse.git