Added support for generating source maps

[dhm116]

I tried to maintain a similar coding style for the changes, but let me know if there's anything you'd like changed!

[filmic]

Your solution is not working because the generated JS file is missing "sourceMappingURL" in a comment line (eg. //@ sourceMappingURL=Footer.map ). Without this line browser will not load a map file.

See how CoffeeScript compiler does it here: https://github.com/jashkenas/coffee-script/blob/master/lib/coffee-script/command.js#L410

[dhm116]

Due to the limitations of the current implementation of source maps within coffeescript, the coffee file must be located in the same directory as the resulting js and map files.

One solution would be to accept an additional parameter on the command line for specifiying the sourceRoot property to be used in the resulting map file(s). However, because the v3SourceMap property returned from the coffeescript compiler is currently a json string, it would obviously require parsing - it may be better to submit a request to be able to modify this parameter either by passing an option to the compiler, or simply being able to modify the SourceMap object instance directly.