working on guide for choosing colormaps. Have overview section and start on a few others.
added colormaps guide to beginner guide
some more text to colormaps
Quiver3d fixes

* numpy 1.6 does not support 3+ arguments for meshgrid
* actually use the sanitized data (fixes broadcasting issue)
* use argi through-out the function
* don't fail on zero flow, just don't draw a quiver
MNT : better error handling on determining gs version

If we fail to parse the version string return (0, 0) to let
the code for dealing with out-of-date versions of gs handle
the case of not installed.
added a bunch of stuff to my colormap info
Merge pull request #3284 from tacaswell/cbook_bxpstats_fix

BUG : fix  _reshape_2D bug with [(n, 1), ..] input
Merge pull request #3300 from WeatherGod/mplot3d/quiver_test_fix

Quiver3d fixes
finished up draft
Merge pull request #3277 from tacaswell/gs_check

MNT : better error handling on determining gs version
Check for GhostScript in this test which needs it
Merge pull request #3302 from jenshnielsen/checkdep_ghostscript

Check for GhostScript in this test which needs it
BUG : restore allow_rasterization on PolyCollection

The was accidentally removed as part of
b8726d09026ba7507d8501de0fbd921ec2d1243e

Closes #3299
Merge pull request #3306 from tacaswell/polycollection_allow_raster

BUG : restore allow_rasterization on PolyCollection
TAG : version bump to 1.4.0rc2
version bump
Fix MatplotlibDeprecationWarning: The "loc" positional argument to legend is deprecated
BUG: fix test error when ghostscript not installed

Confusingly checkdep_ghostscript returns a tuple rather than a bool, so
we need to check an element of the tuple to see whether ghostscript is
installed.  Put the test into a decorator in case we need it for another
test.
Merge pull request #3312 from matthew-brett/fix-ghostscript-skip

BUG: fix test error when ghostscript not installed
Merge pull request #3310 from cgohlke/patch-6

Fix MatplotlibDeprecationWarning: The "loc" positional argument to legend is deprecated