Merge remote-tracking branch 'drart/master'

* drart/master:
  added references and integrated screenshots
  intro revision
More edits. Added new playground images. Expanded the scheduler section.
Winds up the Scheduling section. Time for tacos.
Adds scheduling example and more edits.
Restructures into "How Flocking Works". Adds architecture diagram.
More editing. Adds table to the JSON section.
update bibliography and citations.