CucumberJSDiff

Diff with Cucumber js lib:

# Added timeout for step https://github.com/cucumber/cucumber-js/pull/192
# Call callback only once https://github.com/cucumber/cucumber-js/pull/199

-----
invoke: function invoke(step, world, scenario, callback) {

    +var timeoutValue = Cucumber.Runtime.stepTimeoutValue,
        +timeoutRef;
    
    ...var cleanUp = function cleanUp() {...

    +timeoutRef = setTimeout(function () {
        +codeCallback.fail('Timeout');
    +}, timeoutValue);
    ...

    ...var codeCallback = function (error) {
        +if (codeCallback.wasCalled) {
          +console.error('Callback was already called for this step : ', step.getName());
          +return;
        +}
        +codeCallback.wasCalled = true;
        +clearTimeout(timeoutRef);
        ...

    ...codeCallback.pending = function pending(reason) {
        +clearTimeout(timeoutRef);

    ...codeCallback.fail = function fail(failureReason) {
        +clearTimeout(timeoutRef);