Patch to fix coffeescript's modifying the options object. #8
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The compiler adds attributes to the options object on the first pass; follow-on passes are not decorated with the '__extend()' and other functions coffeescript adds to the top of each generated javascript file. This makes sense when compiling a long list of javascript files into a single file, but grunt-coffee compiles each file into its javascript equivalent at the target end.
This patch gives a fresh clone of the options object passed from the user's grunt.js configuration file to each call to coffee.compile(), thus eliminating this problem.