Function: set
Sets the value of a cookie with the specified key.

Parameters:
(String) key - The key of the cookie you'd like to set
(String) value - The value you'd like to set for the specified key
function set(key, value) {
	debug('setting `%s` to `%j`', key, value);

	if(_.isUndefined(this.cookies)) {
		this.cookies = {};
	}

	this.cookies[key] = value;
}