Initial simple implementation of node subscriptions
Added tests for subscriptions
Capability value updates are no longer SHOUTed, but WHISPERed only to subscribers
Monitor subscribes to all nodes that enter ZOCP
All nodes automatically advertise changes to subscribers
Fixed shebangs
Fixed shebangs
Implement SIGnals
Make testbed more interesting
Make urwid respond to SIGnals
Fix unsubscribe message
Merge branch 'master' into feature_signals

Conflicts:
	src/zocp.py
Fix subscription examples for updated pyre
Register emitters and sensors
Merge branch 'master' into feature_subscribe

Conflicts:
	src/zocp.py
Allow 3rd party (un)subscriptions
Update examples with logging and emitters/receivers
Merge branch 'master' into feature_subscribe

Conflicts:
	examples/simple_node.py
Update examples with Pyre start() method
Update inline documentation