Fix applySourceMap's aSourceMapPath parameter source content support #100
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While improving gruntjs/grunt-contrib-concat#59 after @lydell's insight to use the third parameter of
SourceMapGenerator#applySourceMapI noticed thesourcesContentwas not being honored in my test cases.sourcesContentwould be present, but the array was allnullvalues. To fix that, I have added a small branch similar to that in thethis._mappings.forEachblock inapplySourceMap. To test it, I modified the related test for the second and third parameter ofapplySourceMapto test if it is supportingsourcesContent.