devel docs: minor typo
Fix some minor typos in the paths tutorial
Fix some minor typos in the transforms tutorial
added looking glass demo
added path tut
Remove unmasked_index_ranges from lines.py; it is still in cbook.py
Add docstring.py; I forgot to add it when committing the Coombs patch
Small changes to bar kwarg handling in response to 1200213
pyplot tracks current image at the figure and axes level; fixes ticket 1656374
