Callback function docs
Merge branch '1.x.x' of github.com:Snugug/eq.js into 1.x.x

# By Chris Ruppel
# Via Snugug (2) and Chris Ruppel (1)
* '1.x.x' of github.com:Snugug/eq.js:
  Update CONTRIBUTING with dev instructions
  Reverse my invalid docs.