Squashed commit of the following:

commit c528fcf0d340eae3c64ef4101d947fc87a1812ae
Author: Larry Hosken <lhosken@twitter.com>
Date:   Mon Mar 3 11:37:22 2014 -0800

    incorporate feedback: fix formatting

commit 4566d918c4325eca7d9d72274c7730763d7dc96c
Author: Larry Hosken <lhosken@twitter.com>
Date:   Mon Mar 3 10:24:41 2014 -0800

    docs += Travis-CI status badges in a couple of places
Fix CachedWeb handling of file urls - they have no http response code.
Merge pull request #230 from twitter/jsirois/commons-python/fix-local-repo-caching

Fix CachedWeb handling of file urls - they have no http response code.
add a root rbt wrapper.  this is the same one we use in the aurora repository.

Testing Done:
./rbt

Reviewed at https://rbcommons.com/s/twitter/r/38/