Tagging v1.4.0 release

REL : version bump for 1.4.0rc4

TAG : version bump for RC3

Hopefully the final RC

Release candidate 2 for 1.4.0

Merge pull request matplotlib#3217 from JulianCienfuegos/master

Added some function arguments to the documentation for FuncAnimation

Tagging 1.3.1

Bumping version to 1.3.1

Tag v1.3.1rc2

Tagging 1.3.1rc1

Tagging v1.3.0 release