Configure standalone travis build for kohana/cache

Adds and configures kohana/koharness to build a skeleton Kohana
application and then uses that environment to run the unit tests
on travis (and locally, if required).

Continues kohana/kohana#50
Disable IRC notifications for kohana builds
Merge pull request #51 from kohana/3.3/feat/travis-module-build

Configure Koharness for standalone Travis build