mapbox/mapbox.js — pull request #898 by tristen (2014-10-20 13:47:49+00:00)
Title: Condition IE8 to use base64 encoded sprites

Closes #897 by using a [conditioning](http://browserhacks.com/#hack-c9242a5ec3f073257e275102be15d95f) IE8 to use base64 encoded sprites.