add the code from karma/issues/622 to fix coffeescript coverage

fix and unit test for coffee script instrumentation

Ibrik that uses standard CoffeeScript library.

fix package spelling mistake

:pencil: update readme with CoffeeScript example

credit to Jeff Stamerjohn for the actual commit

ensure JSHint quotation standard

Revert "credit to Jeff Stamerjohn for the actual commit"

This reverts commit f26d01cbf01b03de801bab243fb24072ed8655ba.