Now tracking `composer.lock` - Updates `composer.json`

- Removes `composer.lock` from `.gitignore`
- Updates Laravel to `"laravel/framework": "4.2.*"`
- No `composer.lock` file presently being tracked and current `way/database` requires 4.2+ ... didn't see any other choice
- `phpunit` still passing ... means nothing else is broken right?! ;)