added performance metric diagram and speadsheet that created it
Merge branch 'master' of https://github.com/colinbdclark/flocking-papers
Merge remote-tracking branch 'drart/master'

* drart/master:
  added performance metric diagram and speadsheet that created it
small edits and some formatting
Merge remote-tracking branch 'drart/master'

* drart/master:
  small edits and some formatting