Add Photoresistor Servo example
- Controls a servo based on the scaled value of light from a photoresistor.
Added entry for photoresistor-servo.js to programs.json
Removed reference to led-rainbow.js in programs.json since the file isn't present.
Used grunt docs to generate the docs
Fixed a spacing issue in a commented out console.log statement.
Added led-rainbow.js back, my fork was out of date.
Merge branch 'master' of https://github.com/pierceray/johnny-five

* 'master' of https://github.com/pierceray/johnny-five:
  Added led-rainbow.js back, my fork was out of date.
  Added entry for photoresistor-servo.js to programs.json Removed reference to led-rainbow.js in programs.json since the file isn't present. Used grunt docs to generate the docs Fixed a spacing issue in a commented out console.log statement.
  Add Photoresistor Servo example - Controls a servo based on the scaled value of light from a photoresistor.
Update new example to use "data" instead of "read" event. Regen example files and readme

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>
Adds Ray Pierce @pierceray as contributor

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>