Minor tweak: Test memory as strictly as possible.
Merge branch 'master' of git://github.com/tacaswell/trackpy
more memory testing'
Merge branch 'master' of git://github.com/tacaswell/trackpy
Merge branch 'master' of http://github.com/danielballan/trackpy
Merge branch 'master' of git://github.com/tacaswell/trackpy
BUG/TST: Points were not removed from memory after their Tracks were resumed.
Merge pull request #4 from danielballan/debug-memory

BUG/TST: Points were not removed from memory.
made py3k compatible
updated url information in setup.py
Merge remote-tracking branch 'github/master'
BUG: fixed build logo

Pointed build logo in README.md at the correct path on travis
BUG: added requirements to setup.py

Added install_requires kwarg to setup so that it will (hopefully!)
run cleanly on travis
added python 3.3 to test coverage
tweaked travis install step
more travis install step tweaking
yet more travis tweaks
Improved documentation for `identification`
edits to README
removed python 3.3 from travis build as there are install issues
causing failed builds