Slight refactor of database to make more things happen in ReplicaExchange.__init__
Adjust thermodynamicstates in tests to have higher mixing rate.
Some bugfixes, tests now passing.
Added IOError when attempting to reset states.  Added test.
Merge pull request #66 from choderalab/moredatabase

[WIP] Slight refactor of database and fix for resume bug.
Added amoeba systems and slight changes to resume function
Added amoeba and stuff.
Added example in docstring
Added extend function to extend number of iterations.
Fixed typo in test_parallel_tempering_mpi
Fixed one more typo in test_replica_exchange_mpi
Some cleanup in README.md
Added extra debug info in LangevinMove
Merge pull request #67 from choderalab/amoebaandstuff

Amoeba and run parameter updates
Added travis.yml for simple tests
Copied pgrinaway OpenMM building code into travis.yml
Try to download openmm
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