waitsFor = function(latchFunction, optional_timeoutMessage, optional_timeout) {
  jasmine.getEnv().currentSpec.waitsFor.apply(jasmine.getEnv().currentSpec, arguments);
}
Waits for the latchFunction to return true before proceeding to the next block.

@param {Function} latchFunction
@param {String} optional_timeoutMessage
@param {Number} optional_timeout