Use pull-right rather than a specific float.

This follows the existing style of using bootstrap to do stuff.

Change-Id: Ibe5ee22b4589f8b3367d4d678433912eb76245f3
Fix #46: Allow users not in colleges to edit themselves.

Add a blob in the top right of the navbar which shows the current
user, in the same style as is used in the per-college listings.
Users can now click this to edit themselves.

Change-Id: I65bcd06453efafe8ca5595d75e93eb8e6f747391