add a module level docstring and doctest skips where appropriate
Update README.md
correctly compare topologies for equality
typo
fixed the mass issue between the unitted and non-unitted libraries
Merge pull request #19 from rmcgibbo/topology_equal

Correctly compare topologies for equality
Intermediate checkin of trajectory changes for join() with discard_overlapping_frames
Merge remote-tracking branch 'upstream/master' into single_frame
Added docstrings for discard_overlapping_frames