Settings pane

This is a pull request for adding a settings pane in the UI.

There is a couple of things to do in order to ship it:

- [ ] decide if it should be in the profile (ie. `/profile/owner/name/settings`) or directly in the site (ie. `/owner/name/settings`). Currently it's in the profile part, but it's easy to change it. I think that @joshk wanted to move it to the latter, but I'm not sure at this point.
- [ ] I added link to settings in the cog menu, but there is no link on the hooks page, there is already a "settings" icon there, which points to github. We need to somehow change it

Here is the link in the cog menu:

![](https://d2oawfjgoy88bd.cloudfront.net/52a7571d888b9d160459a3e6/52a75770888b9d16034c9041/52a75780888b9d1600f5dd70.png?Expires=1386785075&Signature=A50ifUoesISOUct0sgYQtgmcdfp2n121Awxoq5OQIO10lz5p72TpHWBQh4tpWRVgC359ua4RY0oRLYvX2X~pXxmAxkA0ZOkGNQSWHnLc0X~eYbErtNqOaUph6VwfSGf4Oo6wkJcnCm1lScXN0MZgSJ8gJr5bYFqtac-yEZXK7b3VhVCp58QlQNr8veHwbh215qt2HWwL5DRHT7MV8lmRjnO-a~NpYQIbFHQpXJvAS0CPeInV8~HskfDYmh33drmTyFGrJrdSR2SGI04ZR7S0yDV9BjzfyShxGbBiFG-oiG1~1W~kfx7249XnsAgmNJUh-HsmXlRpYLCHnIIpgzPxZg__&Key-Pair-Id=APKAJHEJJBIZWFB73RSA)

and the settings pane:

![](https://api.monosnap.com/image/download?id=CGiXf9CWJxuQsfRyE4L5Pn0fZ)