Adding support for coffee-script
Support for coffee-script < 1.6.0
add repository field to readme
added simple support for custom messages
updated installation and example to reflect custom error message support
updated version
added description of changes
updated npm install from https to git
Merge remote-tracking branch 'remotes/Pingdom/feature-coffee'
Merge remote-tracking branch 'remotes/tobius/master'

Conflicts:
	index.js
	package.json
- ignore custom messages which are NULL

- improve the regex to remove the last argument to assert(): assume the custom message is a literal string. This is not a full fix but at least should reduce the number of mishaps when the assert() expression includes function calls with multiple arguments (which therefor have a ',' comma as part of the test expression!)