Added support for using the sourcemap.sourceRoot#136

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fracmak wants to merge 1 commit intogruntjs:mainfrom

fracmak:sourceRootSupport

Commits on Sep 4, 2015

Added support for using the sourcemap.sourceRoot property on injesting sourcemaps so we know where the original file location was instead of assuming it was at the sourcemap path
$fracmak$ fracmak
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