Add initial travic-ci.org config

Add the required configuration file to run the tests against versions
of PHP and install through composer before running specs.

Notifications will be sent to the internal mailing list address.
Remove Guard configuration

Remove the Guard configuration and Bundler config as this is
additional configuration not required at this point.
Add Travis-ci.org status image
The community actively partecipating to improve MageSpec should be
able to see Travis build status also via IRC
Merge pull request #23 from MageTest/feature/travis

Feature/travis