Modified yank.py to run solvent simulation before complex simulation so that free energy of binding can be monitored as complex simulation runs.
Changed alchemy test to use CPU platform to speed things up.
Skip slow tests on travis-ci.
Not sure why slow tests are still running in travis.  Debugging.
Fixed doctest errors in oldrepex by commenting out warning message.
Figured out how to avoid running all tests.
One more try.
Now I think I have the travis nosetests fix.
Merge pull request #72 from jchodera/run-solvent-first

Modified yank.py to run solvent simulation before complex simulation; skip slow tests on travis.