Add Scikit-Image to .travis.yml for tests
Add Scikit-Image to .travis.yml for tests

wd15/chimad-phase-field,usnistgov/chimad-phase-field,usnistgov/chimad-phase-field,usnistgov/chimad-phase-field,wd15/chimad-phase-field,wd15/chimad-phase-field