Applied fix for changes in google drive realtime api

Checking for specific properties with .hasOwnProperty seems to be the method requiring the least amount of overhaul, but I'm not sure if it's robust enough.
Tweaked property list for type checks
Merge pull request #6 from coderly/type-checking-fix

Applied fix for changes in google drive realtime api. Since you implied urgency, I'm merging this, since it works in the current state. If tweaks are needed for the way it works exactly, I can add them later in a separate pull. Fixes #5.