Cleaned up repo and added Travis CI integration

- Added Travis CI integration
- Updated `README`
  - Updated download instructions
  - Added contribution instructions
- Renamed src and dist files to `backfire.js`
- Updated name in `README` to BackFire (used to be Backfire) to be
consistent with other bindings
- Cleaned up `package.json`
- Cleaned up `bower.json`
- Added change log
- Made it so that tests can be run via `grunt test`
- Added `release.sh` script to streamline release process
- Updated karma configuration file