Remove filters and controller middleware. Make boot sequence compatible with medium.

Hello @nicks, @vinibaggio, 

I'm on a mission to make Matador more closely resemble how we actually use it in
Medium.  I'm going to gut a bunch of un-used and confusing functionality and then
start to migrate a lot of what is currently in medium over to matador.

This first change moves the initialization sequence closer to something that medium
can use and removes the notion of controller specific middleware and filters, both
of which I think are confusing and error prone.

Please review the following commits I made in branch 'dpup-yaks'.

5d5be2a6a87d697eefda9c7694405709ba0dc93a (2014-04-03 18:58:58 -0700)
Remove filters and controller middleware. Make boot sequence compatible with medium.

R=@nicks
R=@vinibaggio