Upon document load, hides Google Drive Labels in the list of files displayed in Google Drive
Waits 2 seconds after document load and re-hides the Labels (this is because Google Drive puts them back)
Adds a button to the upper right corner called "Hide Labels" which when clicked, hides all labels on the screen. This is needed because as you navigate through Google Drive, the page doesn't reload and so the hiding logic isn't automatically triggered.
