LB-647: Add metadata for ios application

fixed.
Merge pull request #101 from nistormihai/master

LB-647: Add metadata for ios application
Restored source key attribute (lost during merges)
Merge remote-tracking branch 'sourcefabric/master' into devel
Merge remote-tracking branch 'sourcefabric/devel' into apy-8-implement-x-filter