Clean up unused bower dependencies (#1703)
Clean up unused bower dependencies (#1703)

We're in the process of migrating away from bower so we can start by
removing the stuff it installs that we aren't using.
outoftime/learnpad,popcodeorg/popcode,jwang1919/popcode,jwang1919/popcode,outoftime/learnpad,popcodeorg/popcode,popcodeorg/popcode,popcodeorg/popcode,jwang1919/popcode,jwang1919/popcode