Disable service when the conainter relation is removed.
Compare with None.
Link new hooks to hook.py.
Fix key.
Merged disable-on-container-relation-departed [r=ahasenack,davidpbritton]

This stops and disables landscape-client when the subordinate relation is removed.

It also contains a small cleanup for hooks.py to avoid eval().
Adding iconf.svg (canonical logo, added to charm template in inkscape)
Merging in dpb-trunk icon.svg addition [r=ack,free]