Add support for node-webkit application test automation

[JHarman]

Add support for node-webkit application test automation

• incorporate Chromedriver to be able to start node-webkit application (use: https://github.com/nwjs/nw.js/wiki/Chromedriver)
• extend start_browser method to start appropriate browser
• check whether name of node-webkit application is correct according to Chromedriver requirement. If it is not correct rename it accordingly.
• check whether Chromedriver is located in the same folder as node-webkit application
• add path to folder with node-webklit application to all property files