Alert on selecting more than 1 indepentent variable.
Add .travis.yml
Add travis build status image to README
Also checks depentent variable binning.
Merge pull request #38 from thehyve/issues/UAT-106-disallow-binning-plus-multiple-indep-vars

Disallow binning plus multiple independent variables
Merge remote-tracking branch 'origin/master' into issues/UAT-111-error-on-different-platforms