Add consistent and helpful <title> tags

`<title>` tags should now be unique and meaningful, for:
- Navigating through browser history
- Screen reader users
- Differentiating between many open tabs

Home page:
![screen shot 2014-10-27 at 16 45 47](https://cloud.githubusercontent.com/assets/355079/4795038/2cea9890-5df9-11e4-9705-46776940d4c5.png)
![screen shot 2014-10-27 at 16 46 04](https://cloud.githubusercontent.com/assets/355079/4795040/30a0f290-5df9-11e4-8ca1-2af4e9319b91.png)
![screen shot 2014-10-27 at 16 45 35](https://cloud.githubusercontent.com/assets/355079/4795042/33883356-5df9-11e4-84b1-50292e2177c9.png)

Lots of tabs:
![screen shot 2014-10-27 at 16 49 56](https://cloud.githubusercontent.com/assets/355079/4795060/549b57a8-5df9-11e4-865f-2babbde6261a.png)