String fields of organizations/groups now have default value of ''
[#24] added support for merge strategies in sync client
[#24] Initial scheleton for "merge strategies" tests
[#24] Test passing for name merge strategies
[#24] Tests green for groups merging
[#24] test green for organization merge in datasets
[#24] Fixed owner_org in tests (not a list!)
[#24] Added support for groups merging strategies
[#24] Added support for organizations merging strategies
[#24] Tests for organization merging strategies (fixes #24)
Updated requirements.txt for RTD
Better documentation