The string 'figure' is a valid value for dpi.  Always check if this
is the input, not just if we look it up from the rcparams.

closes matplotlib#6113

This is now taken care of in `canvas.print_figure`.

Fix print figure dpi

DOC: clarified color argument in scatter

Fix: Pandas indexing Error in collections

FIX: plot_date ignores timezone

Closes matplotlib#5575

Conflicts:
	lib/matplotlib/tests/test_axes.py

	   multiple PRs added tests at same location in file
	   keep all.

In some cases Qt may report having a negative height (and presumably
width) in the case of minimizing windows / widgets.  This causes issues
at the Agg layer when the re-size triggers a re-draw which tries to get
a renderer with a negative dimension (segfaults or OutOfMemory errors).

FIX: deal with negative canvas dimension in Qt

Boxplot stats w/ equal quartiles

Backport matplotlib#5343 from phobson/bxp-equal-quartiles

Fix: pandas series of strings
Conflicts:
	lib/matplotlib/collections.py
	  Manually merged changes

If PySide, PyQt4, or PyQt5 are imported do not consult rcparams or
ENV variable to decide which backend to use.

This is a case where ignoring user input is sensible because the Qt
bindings are mutually exclusive and attempting to import a second
binding will fail.  This can result in stand-alone scripts / mpl
embeddings which are dependent on the rcparams to function correctly.

Importing a specific Qt binding is stronger signal of user intent that
either of the other two configuration options and should take
precedence.

closes matplotlib#6164

A check was added change the fall-back behavior if the backend was not
set to PyQt{4,5}, but mpl was being embedded in a larger Qt application.

The previous commit handles the cases where Qt bindings are already
imported earlier in the module so the check here can be removed.

This is not available in the version of nose available for py2.6.

TST: conditionally import assert_sequence_equal

Mnt qt imports