Feat: color coding per site in request logger

[almereyda]

This is the first half of the implementation of #190 proposed by Ward.

This mingles three StackOverflow answers and converts them to CoffeeScript.

• How to change node.js's console font color? - Stack Overflow
• Create a hexadecimal colour based on a string with JavaScript - Stack Overflow
• terminal - List of ANSI color escape sequences - Stack Overflow

It will colour requests in regular and in farm mode. Both escape the hostname. Eventually we will want to consider removing the :vhost token from the logger in regular single-site wikis.

addresses #190

[almereyda]

Proof:

[almereyda]

Please let me know if this meets our coding standards. I have the intuition that the colorString method could be refactored to live in some other place and be imported as a module from there.

If this is supposed to be a plugin, I can also try to rework it.

[paul90]

Looks good. Thanks.