Merge pull request jashkenas#3998 from jashkenas/1.3.3

Create 1.3.3 Release

Merge pull request jashkenas#3978 from jridgewell/1.3.2-rc

Backbone 1.3.2

Bump to v1.3.1

Because I screwed up the 1.3.0 release by not building the min files...
Sorry everyone.

Build v1.3