Added the ability to create JS function compilers#57

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Josiah wants to merge 2 commits intoschmittjoh:masterfrom Josiah:FunctionCompilers

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Commits on Mar 22, 2013

Added the ability to create a function compiler which overrides the normal compilation process for a twig function when its compiled for javascript.
Josiah
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Commits on Mar 23, 2013

Multiple function compilers can be added for each function and can be priortized or opt-out if they don't support a particular node.
Josiah
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