Adding some analytical / numerical binding free energy tests.
Minor bugfixes to new Lennard-Jones pair test system.
More fixes to Lennard-Jones binding pair example.
More fixes.
Enable running of doctests automatically.
Updated numerical integration.
Moved parameters for nosetests to setup.cfg
Fixed bug in WCA fluid cutoff. Had previously been set to `sigma` instead of `rmin`.
Removed some unused variables after running `pyflakes`.
Added command-line arguments back to nosetests in .travis.yml since setup.cfg was not being used.
Added pymbar dependency (for timeseries module).
We don't need pymbar timeseries module after all
Renamed tests-nose to tests
Removed setup.cfg, which requires setuptools and needs nosetests to be run via `python setup.py nosetests`.
Cleaned up tests with pyflakes.
Fixed travis issues with modified nosetests directory.
Eliminated BindingTestSystem abstract base class, and converted a nosetest to generator.
Merge pull request #12 from jchodera/add-binding-tests

Adding some analytical / numerical binding free energy tests
Moved openmmtools to src/openmmtools to prevent wrong import.
Replaced pymbar by openmmtools in doc.