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Encourage proposers to use suggestions box

There's no indication to a proposer that their suggestions will actually
be anonymised, leading some to reply in ad-hoc addenda to the proposal
instead.

This can be ameliorated with a reassuring call to action, telling the
proposer that their identity will be masked in any suggestions they add.
Show proposers' suggestions as "you" and hide face

This helps to reassure proposers that their suggestions are being
anonymised properly.
A proposer "responds" to a suggestion

It makes more sense for a proposer to respond to suggestions than to
suggest.
Added a more fitting favicon
Merge pull request #24 from threedaymonk/anon-improvements

Anon improvements
Merge pull request #25 from andrew/master

Add a more fitting favicon
Latest security patches (rack, rails, json)
Always have a gravatar even if we don't have an email for the user.
Provide an .in_modification_order scope for sorting proposals

Looks at updated_at and the updated_at on any suggestions, taking the largest available.  Does a sneaky virtual attribute load on it too so that #last_modified won't try to calculate it.

Use it on the dashboard to order proposals by modification date so that the "you should look at..." sections maybe make a bit more sense.
Show the travis build image for master branch only
We used this for 3 and 4
Clearer information about how a proposal has been updated.

I've also reduced the size of the update text, since if it is longer
it can take focus away from the proposal title, and that's not what
we want.
Define modes of operation and what we can/cant do in each mode

This is inspired slightly by CanCan, but I didn't really want to introduce a new dependency.  Let's see how it goes.
Add Vestibule.mode_of_operation and set it from ENV in an initializer
Add a controller helper_method for can?
Outline what we want to happen on the proposals controller
Do the easy stuff, don't show mode-dependant call to actions.
Fix the proposals controller for mode dependant operation
Make suggestions mode-dependant