Changed inheritance module to handle different languages.

This involves using the entity_metadata_wrapper functionality
from drupal. Please note that most probably only one language
at a time works properly.
Updated dataset versioning to handle drupal multilanguage system
Merge pull request #16 from thehyve/bugfix/sesi-221-dataset-inheritance

Bugfix/sesi 221 dataset inheritance
Merge branch 'master' into feature/sesi-220-version-number

Conflicts:
	modules/dataset_versioning/dataset_versioning.module