add initial battery of rspec integration tests
revert to kdiff 0.9.96 because 0.9.97 is missing a library (since this is a gui app the test looks a bit weird...)
ensure that the default `gem` command comes from the system ruby, minor cleanup
remove travis-ci configuration since this build must run on windows and thus won't run on travis
Merge pull request #47 from tknerr/add-specs

Add first battery of integration tests