Changes

Fix for cyclic dependencies: #25 (thanks @joost-de-vries, @sveisvei, @GabiGrin, @pearljamik for reporting)
Browserify dependencies added explicitly, npm doesn't pull in dependencies for some users: #24, #28 (thanks @phurst, @oilart, @TheHatSky, @hmil, @Karnich for reporting and testing)
Empty emit output is excluded from coverage instrumentation: #26 (thanks @kubut)
Default compiler options are deep cloned to make sure a fresh copy is used between test runs: #29 (thanks @kubut for tirelessly finding and reporting bugs)

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