implementing modified flag
set id to modeltree
set id for model tree and vis tree
Update .travis.yml

It shouldn't be needed anymore
Initial work towards improved neuroml population
Working on model tree population in neuroml files
Working on model tree population
Added utils class for population
More work towards creation of subentities
Merge branch 'neuromlpopulation' of https://github.com/openworm/org.geppetto.model.neuroml into neuromlpopulation
More work on subentities extraction.
Working in getComponent Utility
Added Optimized LEMS Reader
Merge branch 'neuromlpopulation' of https://github.com/openworm/org.geppetto.model.neuroml into neuromlpopulation
Refactoring
More work on subentities
Release 0.1.7
Fixes for inclusion and neuroml not necessary
Merge pull request #25 from openworm/development

Release 0.1.7