Fix drawing of markers with no stroke
Improve marker_edge test for this case
Ignore doc generated files
Merge pull request #3716 from jenshnielsen/git_ignore

MNT : Ignore doc generated files
Use is to compare with None in backend_pdf
Turn rcparams warning into error and remove knowfail
Merge pull request #3718 from jenshnielsen/numpy_None_warnings

ENH : Use is to compare with None in backend_pdf
Merge pull request #3719 from jenshnielsen/rcparam_warn_error

ENH : Turn rcparams warning into error and remove knowfail
Remove deprecated subplot 0
Update test_test to not use deprecated subplot num
Merge pull request #3721 from jenshnielsen/subplots-deprecation

MNT : Subplots deprecation
Remove PyCXX from _tri module
Completely remove PyCXX
Remove duplicate import_array() call
Fix invalid symbol if numpy 1.6
Merge pull request #3723 from ianthomas23/final_decxx

MNT : Complete removal of PyCXX
Merge pull request #3725 from ianthomas23/3712_numpy_1.6_symbol

MNT : Fix invalid symbol if numpy 1.6
Merge pull request #3724 from ianthomas23/duplicate_import_array

MNT : Remove duplicate import_array() call
Merge pull request #3687 from mdboom/marker-edge-width

BUG : Errorbar markers not drawn in png output