initial checkin for travis config file
Update .travis.yml
Merge pull request #295 from Kosta-Github/Kosta/travis_ci_integration

Travis CI integration
Let SlimClientBuilder figure out "manual start" mode by itself. Requires Descriptor to tell if we're in debug mode.
Move slim port base calculation to one place.
Added unit tests on how to deal with variables.
Add Travis build indicator to README.md.