ENH: Allow kwargs to scipy.optimize functions
ENH: Allow callback for l-bfgs-b
Merge pull request #623 from jseabold/callback-l-bfgs

Allow callback for l_bfgs_b. Allow kwargs to optimization functions.
Added VM for conda package building.
Changed to github release tarball
Merge pull request #625 from kyleabeauchamp/vagrant

Added vagrant scripts for conda build and upload