Improve model selection in linkeddataserver extension

Use new order feature of Store.getReadableGraphsUsingResource() in
linkeddataserver extension
Make TitleHelper tests integration tests
Make Instances test testShownPropertiesAddTitles integration tests
prepare changelog for 0.9.11
prepare dependencies for 0.9.11
forward version id
Add a help text for the filter module

Add a help menu that displays a help text for the default search of the
filter module as changed in Erfurt commit
12fccf078a7adbedaa72ccbc28cf1d594596332c

This commit also includes the German translation of the help text.
Merge branch 'develop' of github.com:AKSW/OntoWiki into develop
Fix type handling in rdfauthor popover controller

Old behaviour: When creating instances, RDFauthor empties all fields that
might contain values, except or the rdfs:type field. rdfs:type was
tested by doing a regex match on the label.

Why changed: This test might fail when someone includes an additional
label, since the test just uses any label, not every label. Moreover, the
regex might yield a false positive as it would match also sub-strings.

New behaviour: We do a simple string comparison of the URIs.
Fix #278 Add Property not working properly
Fix try to get property of non-object, when deleting model
Fix pingback takes for ever

Replace PHP's get_headers method by a curl substitute.
This also solves problems, when importing a new model.
Merge remote-tracking branch 'upstream/develop' into develop