New stlye qt calls

[tacaswell]

Changed all qt calls to 'new style' due to a bug in PySide (see #2378)

In the course of this I discovered that there was some funny merging/un-merging of the patches from @mspacek that resulted in there being no col2hex defined. It may be worth a separate issue to make sure nothing else got lost.

Everything seems to work, but I could not figure out how to get the font editor dialog to come up (I suspect that the italics and bold labels won't show up).

Also includes a bunch of pep8 cleanup

[mdboom]

Sorry, that merge mistake is probably mine. It looks like we'll have to fix it on 1.3.x as well. I'll do it over there, and we'll leave this PR as-is to cover it on master.

[mdboom]

Oops. Forget that. 1.3.x seems fine.

[mdboom]

This seems like the right thing to do -- moderizing rather than putting band-aids that work around unicode_literals.

One thing, though -- I had to do the following, or I got a segfault at startup:

diff --git a/lib/matplotlib/backends/backend_qt4.py b/lib/matplotlib/backends/backend_qt4.py
index 6ae8083..991edc7 100644
--- a/lib/matplotlib/backends/backend_qt4.py
+++ b/lib/matplotlib/backends/backend_qt4.py
@@ -82,7 +82,7 @@ def _create_qApp():
                 if display is None or not re.search(':\d', display):
                     raise RuntimeError('Invalid DISPLAY variable')

-            qApp = QtGui.QApplication([" "])  # probably fine, not used by QT to resolve anything
+            qApp = QtGui.QApplication([str(" ")])  # probably fine, not used by QT to resolve anything
             qApp.lastWindowClosed.connect(qApp.quit)
         else:
             qApp = app

[tacaswell]

There are many failures in travis from errors coming out of locale.py.

[tacaswell]

@mdboom What OS are you testing on? I find it a bit worrying that I was not getting segfaults without that last change.

[mdboom]

I'm on Fedora 19, which has pyside 1.1.0 installed from the standard package (and this is Python 2.7).

[tacaswell]

Does this need anything else to get merged?

[mdboom]

Nope. Merging.

[tacaswell]

It doesn't look like this actually got merged, just closed.

[mdboom]

Sorry about that. I think it's good now.