Rewrite of MultiBackend driver with separate functions for all ILS driver methods. Fix to checkCapability to work properly with drivers using __call() magic method and more data to supportsMethod() for better decision-making including the possibility to use supportsMethod also without _call(). Updated MultiBackend tests.
Ignore empty string response

Empty string response is not an image
Merge pull request #202 from prolic/patch-4

Ignore empty string response
Updated translations from Christian Dabrowski.
Merge branch 'release-2.3'
Starting VuDL tests.
Needs test to run tests on VuDL huh...
The world isn't ready for this test yet.
VuDL test stash
Advanced search control links now on their own line.
Merge branch 'release-2.3'

Conflicts:
	themes/bootstrap3/templates/search/searchbox.phtml
Updated translations.
Updated translations (courtesy of Christian Dabrowski and Arek Danszczyk).
Merge branch 'release-2.3'
Restored code lost in merge.
Progress on VuDL tests.
Restored change that triggered the need for the restore in the first place.
Added language fallback to 'en' in addition to the existing default language.
VuDL Solr Connector test.
Merge branch 'vudltests'