SpawnOn: add 'exec' to shell strings where possible
SpawnOn: add 'exec' to shell strings where possible

Ignore-this: c7de4e05803d60b10f38004dcbda4732

darcs-hash:20090212234608-25a6b-50ee5321e891aa595cd247ac2e4823f08df266f3

jthornber/XMonadContrib,jthornber/XMonadContrib