fucked it up

Switching gears to presume empty database and establish process for
importing twitter_archive files obtained from Twitter. In order to
accommodate this, implemented privateEvent and privateTweet models
using mongoose-multitenant. Workflow will now be for users to import
and draw from their own collections in order to build the collective
events that will constitute the shared collection. Opens the door also
to self-curated collections, although ultimately this tool is meant to
be used collectively.