changes for connections
update schema with custom properties and visualreferences for
connections. Remaining work with connections serialization
changes for connection
fix glitch in serializer
Some more refactor
Merge with connection branch, updated to latest neuroml and lems
version, added org.neuroml.export bundle as dependency and fix some bugs
regarding connection nodes
Fixed textmetadata node
Validate if modeltree is empty
Added a couple of functions to ease visualobject and customnodes
creation inside connections node
Merge remote-tracking branch 'origin/development' into connections
Adding visual group node and element. Serializes new noes.
Merge remote-tracking branch 'origin/neuromlpopulation' into connections
Merge pull request #44 from openworm/connections

Connections