Add ability to use libpng-config to get linker flags
BUG: 3 fixes for widgets (MultiCrusor, SpanSelector, Slider)
copy FontProperty objects to solve bug #3327
test for issue #3327
Merge pull request #3394 from tacaswell/input_type_faq

DOC : add note about np.matrix and pandas objects
Merge pull request #3397 from tacaswell/install_guide_tweaks

Install guide tweaks
Merge pull request #3399 from jenshnielsen/cherrypick-v140

Cherrypick doc changes to v1.4.x
enlarge on windows build instructions slightly
fix '-'
Merge pull request #3401 from jbmohler/winbuild_redir

Doc : enlarge on windows build instructions slightly
REL : version bump for release
DOC : updated user stats
Merge pull request #3378 from cimarronm/custommarkersizefix

BUG: Fixes custom path marker sizing

Closes #1980

Closes
Merge pull request #3244 from jenshnielsen/rcwarnings

Filter warnings in rcparams test (and others)
Merge pull request #3278 from milljm/libpng-config

BLD : Use libpng-config if available
Merge pull request #3335 from fcolas/newfix#3327

BUG : use copy of font-properties for each axes title

closes #3327
Merge pull request #3241 from jenshnielsen/numpy_clean_warnings

Cast to integer to get rid of numpy warning
Merge pull request #2635 from mdboom/font-crash

BUG : Don't clear glyphs if face never made
Merge pull request #3282 from jenshnielsen/mollweide_warning

Catch warning thrown in Mollweide projection.
test_text Modify filter warning regex

The regex will not match in python 2 since this is a unicode literal.
Fix that by adding an optional 'u' to the regex.