Add bower support

Hi Liam, 

i add a bower.json file, so that your module can be installed in a bower supported project. 
I did not publish it yet, because in my opinion its better that you publish your own projekt.

Please take this bower.json file and publich it to bower:

```
bower register backbone-schema git://github.com/liamcurry/backbone-schema.git
```

After the registration process i can use your module in my build chain :-) 
Thanx a lot. 
Peter Shaw