Add title/heading to list view

The navigation module displays a title (e.g. a class name) that
is now passed to the list view in order to display a title. This helps
to remember, where the displayed list of instances is actually coming from.
The legacy method getSelectedClass() from the Model/Instances.php was not
used because it fails to provide a name for customized entries in the
navigation module.

NB: some additional testing and refining is probably needed
Add event to sort properties in RDFauthor

In ServiceController an event is triggered to sort properties for RDFauthor.
Therefore the json output now contains an array of sorted properties that has
to be treated in RDFauthor.
Remove multisort and use arsort instead
Fix typo
Add missing array-key
Pass propertyOrder to RDFauthor

Note: Passing options to RDFauthor will be refactored in one of the next
commits. Instead of passing each variable separately, an options object
will be constructed.
Fix bug when sorting extension is disabled
Refactor options for RDFauthor into an object

Here and in the formbuilder feature branches we pass additional options
to the RDFauthor. Since it is cumbersome to identify arguments by position,
we create an object to hold the different options.
Change sort option to SORT_NUMERIC

In array_multisort 'SORT_STRING' was given, but the array that has to be sorted
contains integers that were exlicit casted from string before.
(e.g. sorting 11, 2, 1 resulted in 2 >= 11 >= 1 and now results in 11 >= 2 >= 1)
Remove superfluous parameter
Insert sort_flags SORT_NUMERIC in both events
Pass optional property order also to edit mode

The optional property order is now also passed to the popover window when
editing a resource (via context/hover menu -> "Edit Resource")
New Versions of erfurt and rdfauthor added
Merge github.com:AKSW/OntoWiki into develop
Merge branch 'feature/extendedVersioning' into develop
Function added that allows for only displaying specified classes
Merge branch 'feature/extendedVersioning' into develop
Remove OntoWiki_Controller_Service. Fix #242.
Inject an i18n variable 'RDFAUTHOR_LANGUAGE'

The variable 'RDFAUTHOR_LANGUAGE' holds a string with the set language
('en', 'de', etc...) This tag will be used by the RDFauthor to provide
an i18n.
Add i18n for RDFauthor popover controller

This commit works together with the i18n commits of the RDFauthor
formbuilder branch. Translation works without this commit but in order
to translate string with parameters (e.g. the title), some changes have
to be made in the support.js as well.