Add `ensure => stopped` feature
Do not autostart the service when `ensure => stopped` is requested
Fixup dependency order for ensure stopped

 * Also adds ensure running with the some behavior as present
Extract variable for supervisor log dir
Merge pull request #68 from Jimdo/ensure_stopped

Add ensure stopped and running to supervisor service
Move debian defaults into params class
Split tests for each supported family
Fix tests for redhat service
Declare user explicitly as instance variable