fixed issue #31 (add vocabulary metadata to json)
Merge remote-tracking branch 'upstream/master'
added get_thesaurus_by_name and get_thesaurus_by_machine_name functions
moved to/from xml functions
merged
Merged master with smanousopoulos/master
Minor re-arrangement at inspire_vocabularies module (added reference metadata). Fixed #31.
implemented new xml serialization logic for INSPIRE
Renamed keys/functions for INSPIRE vocabulares (names vs titles). Added a simple factory for a Thesaurus object.
Fixed typo
Merged with smanousopoulos/master. The XML serialization for INSPIRE metadata is moved to a dedicated serializer.