FREE HybridAutoScreenhot Tool 
Use this tool to automate the process of create standard screenshots (portrait and landscape) ready to upload to the Android and/or Apple store.
Available for all platforms Mac, Linux and Windows.
This command-line tool is specially useful to automatize the tedious process of taking screenshot of your hybrid application specially when you support multiples language.
This can be integrated into your Continuous Integration process since it is a command line tool.
If your app can run in a browser, then this tool will work for you