Improved the naming of the test cases / screenshot files.

...rome/1920x1200/Home page viewport looks good_viewport.png

...eference/Chrome/1920x1200/Home page viewport_viewport.png

...s/reference/Chrome/1920x1200/Join Audio modal_element.png

...e/1920x1200/Logout popup closes successfully_viewport.png

...ence/Chrome/1920x1200/Logout popup looks good_element.png

...me/1920x1200/Public chat closes successfully_viewport.png

...eference/Chrome/1920x1200/Public chat closes_viewport.png

...rence/Chrome/1920x1200/Public chat looks good_element.png

...nshots/reference/Chrome/1920x1200/Public chat_element.png

...Chrome/1920x1200/Settings dropdown looks good_element.png

...hrome/1920x1200/Userlist closes successfully_viewport.png

...s/reference/Chrome/1920x1200/Userlist closes_viewport.png

...eference/Chrome/1920x1200/Userlist looks good_element.png

...reenshots/reference/Chrome/1920x1200/Userlist_element.png

...good with both userlist and public chat open_viewport.png

...x1200/Viewport looks good with userlist open_viewport.png

...port with both userlist and public chat open_viewport.png

...Chrome/1920x1200/Viewport with userlist open_viewport.png

...hrome/960x1200/Home page viewport looks good_viewport.png

...reference/Chrome/960x1200/Home page viewport_viewport.png