Add a global trigger argument for wait timeout.

[mengchen2]

locatorObject[locatorId + 'Wait'] = function (timeout, msg) {
return drivex.waitForElementPromise(locator(), timeout || 5000, msg || 'Wait failed for locator [' +
locatorId + ']');
};
locatorObject[locatorId + 'WaitVisible'] = function (timeout, msg) {
return drivex.waitForElementVisiblePromise(locator(), timeout || 5000, msg || 'WaitVisible failed for locator [' + locatorId + ']');

If we don't provide a timeout value to the wait() method, the default timeout is only 5s, which sometime not long enough.

To have all that 5s default timeout to be config globally by a plugin arg will be great

[mengchen2]

PR #82 raised for this.