Remove jasmine interal function calls from stack.

This fixes the stack trace verboseness part of #4.
This is not guaranteed to work all the time now. 03d7e217a3a8868d28b33e934b85af8cecddc3d6 makes it so the jasmine-core library to use to run the specs can be passed into jasmine-npm. Jasmine-core needs this to test itself properly, but maybe we just let it not get cleaned up in that case.