resets modified flag of entity and aspect nodes upon exit
send requestID for scene updates of visitor who started simulation, used
for testing purposes mainly
changes needed after switching from name to id in serialization
adding connection nodes while creating runtime tree
Merge pull request #66 from openworm/connections

Connections
Geppetto version -> 0.1.8
Merge pull request #67 from openworm/development

Release 0.1.8