dummy change
removed max_dates
Added inspire common tests
merged common schemata/types from initial-data into lib.metadata.schemata/types.common.py
Created Thesaurus class for keywords and added relevant tests
minor fix: added min_length = 1 to all required lists
pep8 fixes
added string matching for more detailed invariant tests
minor test updates
added more tests
Merged with smanousopoulos/19-widgets
Merge fixes (draft, not tested)
Update pip requirements
Reviewed imports for schemata/types. More PEP8-friendly tests
Cherry-pick from 63371c24ab470e2ab4f7dd86e78e4c8080b5fd6e (attempt to fix #27)
Reviewed INSPIRE-related tests
Merge branch '19-7-widgets' into 19-widgets