docstring: direct pcolor users to pcolormesh; fix pcolorfast docstring
Merge pull request #1353 from efiring/pcolor_doc

docstring: direct pcolor users to pcolormesh; fix pcolorfast docstring
PEP8 fixes on backend_bases.py
Merge pull request #1350 from NelleV/pep8_units

PEP8 fixes on units.py
PEP8 fixes - breaks
PEP8 fixes on tight_bbox.py
PEP8 fixes on tight_layout.py
fixed lognorm clip behavior
added test
PEP8 fixes - break points and identation
Merge pull request #1362 from Tillsten/lognormfix

fixed lognorm clip behavior
fixed lognorm clip behavior
added test
Merge pull request #1359 from NelleV/pep8_tight_bbox

PEP8 fixes on tight_bbox.py
PEP8 fixes on tight_bbox.py
Merge pull request #1360 from NelleV/pep8_tight_layout

PEP8 fixes on tight_layout.py
PEP8 fixes on tight_layout.py
PEP8 fixes - break points and identation
Merge pull request #1349 from NelleV/pep8_type1font

PEP8 fixes on type1font.py
PEP8 fixes on type1font.py
PEP8 fixes - small backslashes and breaks fixes
Merge pull request #1351 from NelleV/pep8_transforms

PEP8 fixes on transforms.py