Merge pull request #2100 from glyg/master

Remove DeprecationWarning in simple_linear_interpolation
Skip the pep8 conformance test when the pep8 tool is not installed
Merge pull request #2103 from mdboom/pep8-skip-when-pep8-not-installed

Skip the pep8 conformance test when the pep8 tool is not installed
Fix 64 bit compatibility on Windows

Use `Py_ssize_t` (64 bit on win-amd64) instead of `C long` (32 bit on win-amd64) to handle `pointers` (64 bit on win-amd64).
Fix building Python integers from size_t values

Use the `n` format specifier instead of `l` to build Python integer or long integer objects from size_t values.
Merge pull request #2107 from cgohlke/patch-1

Fix 64 bit compatibility on Windows
fix position of rotated mathtext in agg backend
Make setup work on platforms where multiprocessing does not.
Merge pull request #2111 from leejjoon/fix-text-position-agg-backend

fix position of rotated mathtext in agg backend
Don't draw bottom line of histogram when it is unfilled.
Merge remote-tracking branch 'upstream/v1.2.x' into v1.3.x
Merge pull request #2113 from mdboom/histogram-step-unfilled-bottom-line

hist() bottom line now showing (regression?)
Merge pull request #2083 from pelson/longer_date

Added a wider range of day ranges for the AutoDateLocator.
Merge pull request #2115 from mdboom/multiprocessing-during-setup-1-3

Make setup work on platforms where multiprocessing does not (1.3.x version)
Merge remote-tracking branch 'upstream/v1.2.x' into v1.3.x

Conflicts:
	setup.py
fix issue #1881, pgf: add style information for hatchings
pgf: add hatching to test figures
Merge pull request #2116 from pwuertz/fix_1881

fix issue #1881, pgf: add style information for hatchings
Treat pushing a second mouse button during a rectangle zoom as "cancel" rather than putting us in an unresolved state.
Fix some segfaults when using newer Microsoft fonts.