Third performance run: Class variables for defaults.  Considerable space effeciency.
Third performance run, part2: Link class variables for defaults.  needNeighbors moved to Model/Patch constructors.
Patch drawing performance: improved pixel manipulation and big/little endian implementation
Agent drawing performance: very primitive sprites
Agent drawing performance: ant model
Agent.links cache, fix Patch.agents, coffeescript version 1.5
Add directed link methods
Add directed link methods
Add directed link methods
Agent Links/Neighbors: Adjust names to match netlogo
index.html page lists sample, test models and doc

Create index.html at root of repo for looking at samples
and doc to make it easier for someone who clones repo to
investigate.

Also makes creation of useful gh-pages branch easier.
add additional contributors section to readme.md
Add ability to attach a spotlight to an agent