Python 3.4 is live on Travis CI - #641

Build errored due to problems on Travis CI.

I restarted this older build that has no 3.4. It was previously all green, but now errors on all but 2.7 and 3.2.
https://travis-ci.org/hugovk/Pillow/builds/23292576

I've reported it to Travis CI: travis-ci/travis-ci#2219

Problem was with these lines in .travis.yml:

# for python-qt4
virtualenv:
  system_site_packages: true

Removing them allows the tests to run.

I put 3.4 as an allowed failure because the homemade test runner chokes on the print output:

running test_000_sanity ...
/home/travis/virtualenv/python3.4.0/lib/python3.4/imp.py:32: PendingDeprecationWarning: the imp module is deprecated in favour of importlib; see the module's documentation for alternative uses
  PendingDeprecationWarning)

(cc #592)

Nice thanks

For reference, here's feedback from Travis about system_site_packages. Summary: it's only available for 2.7 and 3.2 and "you can test with and without system site packages for the same Python version".

travis-ci/travis-ci#2219 (comment)