Added some stuff for travis-ci.
Added nosetest to run script.

Includes renaming setup script to remove dash.
Initial travis test.
Fixed requirement: openmm instead of simtk.
Install nose as a requirement.
Removed any mention of gaff2xml.
Added specific openpyxl version requirement.
Added available openpyxl version.
Merge pull request #8 from bas-rustenburg/travis

Travis build and simple test