Updated README with troubleshooting for Ubuntu
Accidentally sets the wrong uncertainties to zero
When numbers are negative, but only up to numerical precision,
we automatically set them to zero.  But this reset used incorrect arrays.
This commit should fix the problem.
Fix to previous commit.
Added draft of modified travis-ci workflow to build pymbar-dev conda package.
Attempted workaround for version travis conda issue.
Updated setup.py with latest mdtraj version of writing of version.py
Restrict travis to just test python 2.7.
Merge pull request #80 from jchodera/conda-ci

pymbar-dev conda package creation via travis-ci
Updated README with conda installation info.
Updated encryption key in travis.yml
Merge pull request #79 from mrshirts/master

Accidentally sets the wrong uncertainties to zero