Removes Chain from MpiMcmcApplication
Moves base9/Chain.hpp to sampleWDMass (as a temporary measure)

A new chain representing MCMC is going into mpiMcmc, so the old Chain (which was just acting as a container) had to go. sampleWdMass needs to be updated to individually work with a Star vector and Cluster, so it got the old Chain until I fix that
Adds .travis.yml