Issue 113 - Updated dependencies

[Nomeasmo]

Please note:

• Promise now needs to call .fulfill() instead of .resolve(); Refactor your code.
• Please remove all createOrReuseSession() code an use helper function instead; Refactor your code

var helper = require('..').helper;
...
helper.getDriverPromise().then(function (result) {
     driver = result;
});

• The helper also singles a call to postBackCoverage. Please refactor.
• If you used nom install on a MacOS I' delete the node_modules from the test/rtd folder and call ./rtd directly (main reason for having troubles with the instanbul-middleware-port. The shell script calls nom install with the option --save-optional)
• Added asyc module.

Sam: I temporary disabled the closeWebdriverSessions task. It does not run with the update and appears now unnecessary. Please remove completely, if you agree. The examples are also updated and reflect the changes.

[samhatoum]

This has now been merged. Thanks a lot.

[samhatoum]

The problem with removing closeWebdriverSessions is that it leaves browser windows open when grunt runOnce is used. I'll look at this seperately

[samhatoum]

Ok, enabling it seems to not cause any issues, so I'm doing that now. Thanks again for your help on this.