ENH add support for string input with classification metrics
ENH use the new format syntax
ENH remove inspect
TST fix string labels in metrics tests

Also found a faulty format op in the error handling.
COSMIT
Update what's new
DOC state that string is possible
TST with labels arguments
FIX what's new...
use new virtualenv features of travis, so we don't have to kill the virtualenv
DOC copyedit preprocessing docs
Merge pull request #2228 from amueller/travis_virtualenv_stuff

use new virtualenv features of travis,
Trying to enable python 3.3 too.
Update .travis.yml
ENH: Add the hungarian algorithm
TEST: Increase testing of hungarian
MISC: cosmit in hungarian
ENH: Speed up in hungarian
ENH: More speedups in hungarian
ENH: More speedups in hungarian