Add mocha compiler options to configuration file:

    `--compilers coffee:coffee-script`

This enables me to run my tests with just `mocha` command
Add all progress as of 2013-09-04
Update documentation string to reflect reality
Add a failing test for '0,0,0' -> '000000'
Implement code to convert '0,0,0' -> '000000'
Remove temporary variable `lookup`
Add a failing test for rounding down numbers > 255
Implement rounding down numbers > 255
Add failing test to do conversion for all numbers
Implement conversion for all numbers
Add a failing test to round up numbers < 0
Implement rounding up numbers < 0
Minor tidy up for consistency
Can use an array instead of hash for `lookup`:

One of the solutions listed implemented the solution this way -

http://www.codewars.com/dojo/katas/reviews/516f30207c907a79f20000f3/groups/51e79da2473e08551d0000b8
Remove the string interpolation
Use a more descriptive name
More succinct way to say n in 0 .. 255:

     Math.max   0, n - returns the greater of   0 and n
     Math.min 255, n - returns the smaller of 255 and n

Again had to look at the solutions provided by others.
Add note on useful information source (hex table)