Start to update docs for spectral/Spectral change
change spectral to nipy_spectral, leave spectral as alias, update docs
align nipy_spectral_data, double backquotes
Make loc come after fontdict in set_title. Closes #1759
axes3d's set_title sould return the Text object
Also needed to swap the arguments in docstring
Also need to fix the title() docstring in pyplot.py
unit test for making `step` respect linestyle as a kwarg
Changed `step` to append the user specified `linestyle` onto the
`linestyle` that is passed to `plot` instead of silently ignoring it.
pep8 fixes
variable name tweaks for readability
fixed random text insertion
fixed small issues with png test output, probably related to changes made in c48afe4b36112c58a45621c58c4a9f6f767f82c5
Merge pull request #1827 from NelleV/MEP10_axes_common_plots

MEP10 - documentation improvements on many common plots: scatter plots, ...
backend_ps: Do not write to a temporary file unless using an external distiller.

If ps.usedistiller is omitted, writes directly to the output file, instead of
creating a temporary file and subsequently copying it to the output.

This is more efficient, and also works on restricted platforms such as Google
App Engine, which are unable to provide a writable temporary file system.
Merge pull request #1826 from mgiuca-google/backend_ps-no-temp-file

backend_ps: Do not write to a temporary file unless using an external distiller
added CHANGELOG entry for this feature.
Added new module, matplotlib.subprocess_fixed, as a replacement for subprocess.

cbook: Moved check_output to subprocess_fixed.
backend_pgf: Import check_output from subprocess_fixed instead of cbook.
All modules now use matplotlib.subprocess_fixed instead of subprocess.
subprocess_fixed: Gracefully handle platforms without subprocess.Popen.

If subprocess.Popen is missing (for example, on Google App Engine), replaces it
with a dummy version that raises OSError. In these environments, calls to
subprocess will be handled properly as if the called app could not be found,
instead of raising AttributeError.