Added 'get_window_size' and 'set_window_size' keywords mirroring the selenium functions.
Refactored parameter from dictionary (which would have required the Collections Library) to two numerical parameters mirroring the underlying selenium function.
Updated keyword documentation for set/get_window_size.
Updated keyword documentation to include two new keywords: set_window_size, get_window_size.
Revised keyword documentation with real good suggestions from Kevin Ormbrek.
Updated CHANGES.rst noting the addition of 'Get Window Size' and 'Set Window Size' keywords.
Merge branch 'get-set-window-size'