Introducing sheaves for gates, using "oomph"
instead of activation (to be replaced later)
Introducing sheaves for slots
Merge branch 'nodenet_sheaves' of github.com:joschabach/micropsi2 into nodenet_sheaves

Conflicts:
	micropsi_core/nodenet/node.py
	micropsi_core/nodenet/nodenet.py
	micropsi_server/static/js/nodenet.js