Extend throwsException() assertion to handle testing against error objects

[jamesbebbington]

Does what it say on the tin really; I've extended throwsException() so that you can pass it an error object against which the actual exception is compared.

e.g.

assert(function(){
    throw(new SyntaxError("expected message"));
}).throwsException(new SyntaxError("expected message"));

Equality is determined by comparing the error name and message. See specs for additional examples.