update entity modified flag to true when aspect sub tree changes
Merge pull request #24 from openworm/master

Updating dev
changes needed after switching from name to id in serialization
Merge pull request #25 from openworm/connections

changes needed after switching from name to id in serialization
Geppetto version -> 0.1.8
Merge pull request #26 from openworm/development

Release 0.1.8