Merge branch 'master' into old

* master: (28 commits)
  Update readme
  New MVP app.js
  Update package.json
  Update package.json
  Use stream-tee module
  Style change: Double quotes ok
  Add out base class
  Sparser tee constructor
  Make store base class
  OMG
  twitter_in -> twitter_stream. Emits named event
  Tee listens to input for named event
  Tee takes name argument
  Match current implementation
  Add mifflin out
  Finish mongo store
  Fix mistake in tee.js
  Update mongo store
  Add mongo store
  Rename: emit -> output, stream -> input
  ...