Add Versions to Images fixture

*Added versions and versions list to Images fixture
*Added get_comparison_data method to be used universally
*Removed versions and version list from Images fixture
*Removed try block when opening data file
*Rebased from latest master

Change-Id: I9f90a4cd89b965bc8e7c605aaa7b1399ad0e3bd5
Merge "Add Versions to Images fixture"