add cinnamon target

Fixes #220
add -t cinnamon to startcinnamon
move cinnamon target check to beginning of file
fix cinnamon target in Debian

There are no packages in jessie for Cinnamon, and no ARM builds for Cinnamon in Debian at all right now.
fix help and icon theme for cinnamon
Merge pull request #306 from smibarber/cinnamon

Cinnamon target