CoffeeScript not supported by PhantomJS 2.0

[logankoester]

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PhantomJS 2.0 removes CoffeeScript support (https://github.com/ariya/phantomjs/issues/12410), which causes CasperJS to hang until killed on .coffee files, resulting in an ENOENT error in meteor-casperjs on the xml report files that never get created.

We could remove coffee support from meteor-casperjs to match, but I'd strongly prefer not to.

The solution would be to compile the coffee files to a temporary location in runTestFile() prior to running the tests.

HOWEVER CasperJS is already aware of this issue (https://github.com/n1k0/casperjs/issues/1203), and they are currently considering adding that compile step themselves.

If we're feeling patient, we can wait and see where https://github.com/n1k0/casperjs/issues/1203 goes on their end.

[logankoester]

As a workaround, you can install phantomjs-1.x alongside phantomjs-2.x (on Arch Linux, the phantomjs-1.8 AUR package exists for this purpose) somewhere on your system and then set the PHANTOMJS_EXECUTABLE environment variable to point to it.