Add test capturing failure on Python 3 in egg_info.get_svn_revision (#20). egg_info.get_svn_revision is now a staticmethod.
Reference parsed svn version variable instead of the whole of the data. Fixes #20
Added tag 0.7.4 for changeset 85640475dda0
Bumped to 0.7.5 in preparation for next release.
Merge with 0.7.4