Adds focus state to toolbar buttons, form fields, and links

Before:
![screen shot 2014-11-11 at 6 08 59 pm](https://cloud.githubusercontent.com/assets/186715/5004187/f49e7872-69cd-11e4-9969-5f9ac0b4aa18.png)

After:
![screen shot 2014-11-11 at 5 51 36 pm](https://cloud.githubusercontent.com/assets/186715/5004188/f73ced0c-69cd-11e4-894b-2928ab19177b.png)

Before:
![screen shot 2014-11-11 at 6 09 12 pm](https://cloud.githubusercontent.com/assets/186715/5004190/fa4cc9cc-69cd-11e4-8401-ae8d4d1173af.png)

After:
![screen shot 2014-11-11 at 5 51 58 pm](https://cloud.githubusercontent.com/assets/186715/5004191/fe7fe06a-69cd-11e4-9509-f0cbf8655568.png)

Before:
![screen shot 2014-11-11 at 6 09 37 pm](https://cloud.githubusercontent.com/assets/186715/5004194/02cccb56-69ce-11e4-8bd9-10ddb823f089.png)

After:
![screen shot 2014-11-11 at 6 07 54 pm](https://cloud.githubusercontent.com/assets/186715/5004196/06edf5c0-69ce-11e4-9aaf-70f9750394bc.png)