Update test failure expectations for Firefox 31
Remove test failure expectations for untested Firefox versions 26, 27 and 28.
Merge pull request #593 from alancutter/updateExpectedFirefoxFailuresVersion31

Update test failure expectations for Firefox 31
README typo
Merge pull request #596 from nevir/patch-1

README typo
Explicitly allow PIL to be installed from external sources.
Make sure pip version is able to support external sources