I think travis is working now!

There are some failures due to python 3.x issues that are addressed separately in #3

To save time in future travis runs, we can cache the equilibrium data using this scheme.

We'd probably want to make it possible to override DATA_PATH by an environment variable $BENCHMARK_DATA_PATH so that we can cache the data in $HOME/data instead.

This is going to be super useful in debugging #3, so I'd suggest merging this PR first and then merging the latest changes into #3 when you pick things up again.

Ahh, thanks for putting this together! Just looked over all the changes, and they look good to me. Will make a couple minor edits to Yank-specific devtools files, then merge. I'm a bit puzzled by some of the Travis failures (e.g. No module named 'numpy'), but will look into this later...

To save time in future travis runs, we can cache the equilibrium data using this scheme. We'd probably want to make it possible to override DATA_PATH by an environment variable $BENCHMARK_DATA_PATH so that we can cache the data in $HOME/data instead.

Good idea! Will add an Issue to remind me to do this...