function getArguments() {
  return arguments;
}
Jasmine 2.1 requires that objects be constructed with the same constructor in
order to be considered equal.  The 'arguments' keyword looks like an array, but
it's actually (at least in Chrome and Firefox) constructed with a special
constructor, so it never compares Jasmine-equal to an array.  This function lets
us create an arguments array.
@alias getArguments
@return {Array} The arguments passed to the function.