craftyjs/Crafty — pull request #838 by FallSe7en (2014-12-01 00:26:31+00:00)
Title: Add/remove Sprite components sometimes fails to change background-image

When switching between two Sprite components that use different background
images, the second background-image fails to get set properly.

This happens because style.backgroundColor is an invalid value when trying to switch to the second component (it is "initial").