Karma config updates

- moved karma.conf.js to test directory for consistency with the protractor config
- removed load for app.js since it was moved into a module
- replaced src path in karma config and grunt file
- added version service and example test to kalabox module.
- standardized relative path on grunt file to not use `./` since most paths didn't. Perhaps something we should standardize on everywhere.

This pull request is based on pr #56