Add init.d script for Debian. Requires dpkg >= 1.16.5.

This init.d script has configurable parameters. The way I configured
it requires 3 things:

1. A system user called nodejs which has its own group and homedir.
2. A system user called redis-commander which belongs to the nodejs
   group and uses the nodejs homedir.
3. The nodejs homedir MUST have g+w permission so redis-commander
   have permision to write as well.

Below is a step-by-step to get it up and running:

	# useradd --system -m -s /bin/false nodejs
	# useradd --system -d /home/nodejs -G nodejs -s /bin/false \
	  redis-commander
	# chmod g+w /home/nodejs/
	# cp dist/debian/init.d/redis-commander /etc/init.d/
	# chmod +x /etc/init.d/redis-commander
	# update-rc.d redis-commander defaults
	# service redis-commander start
Fix missing PATH in init.d script.
Merge pull request #98 from jweyrich/master

Add init.d script for Debian. Requires dpkg >= 1.16.5.