Basic account preferences

None of the preferences or follows do anything currently. This just sets it up.

Adds a `GamedayLayoutType` which enumerates the layout preference. Stored in the Datastore as an integer. Defaults to the same default on Gameday currently (1+2).

Follow events/teams format:
`["2013ohcl", "2013mnmi"]` `["47", "121", "11"]`

I wasn't sure if typeahead was working again yet, but the plugin used for the follow fields is compatible with twitter-typeahead, among others. A future PR could integrate it.
More info on the plugin: http://timschlechter.github.io/bootstrap-tagsinput/examples/bootstrap3/

![tba-edit-details](https://f.cloud.github.com/assets/2099988/1188278/d223b790-23c3-11e3-9c8f-4d89053054cb.png)
![tba-edit-prefs](https://f.cloud.github.com/assets/2099988/1188280/d24dc94a-23c3-11e3-9930-ac2db2e77dc1.png)
![tba-edit-follow](https://f.cloud.github.com/assets/2099988/1188279/d238d97c-23c3-11e3-9c47-64d028fa471b.png)

Closes #703