Per committment four on #623, this is the commit that adds the closure compiler to the build system.
Also added the lift-vars argument to the js uglfier, so it knows it can move around variables (safely) inside functions.
fix assertEqualCollection test method
Merge branch 'master' of https://github.com/madrobby/zepto
Optimizing the optimizer, by lifting vars
added the closure compiler at two different compilation levels. Hopef…
…ully we can move to using it.