CI: testing newer matplotlib with jinja
I don't think this should work at all w/o jinja2

just raise a nice error 
 Are you talking about the warnings? those were just so I could see them in the Travis logs (wasn't sure when setUpModule gets called). It errors as soon as you `df.style` if you don't have Jinja.

forgot to mention, my last run succeeded. I'm building from my real branch [here](https://travis-ci.org/pydata/pandas/jobs/91149197). It would be nice to remove the globals and stuff in `test_style` though.
 I am a tad confused about the link between mpl and jinja...
 Well I'm extremely confused by it :). I haven't been able reproduce it locally, but from my other PR I found out that _trying_ to import Jinja, whether it's installed or not, was was what caused the failures, which makes no sense at all. It's [these](https://github.com/pydata/pandas/blob/master/ci/requirements-2.7_LOCALE.run) requirements if your curious (that's matplotlib 1.2.1, so you might not be).
 @TomAugspurger keep open?
