Merge pull request #1 from twalcari/master

Added iMinds ontology files
NTUA ontology files
Update README.md
Merge pull request #2 from twalcari/master

Added iMinds wireless ontology files
updated iminds wireless and partial nitos advertisement in owl
cleanup
modeled f4f federation
Merge branch 'master' of github.com:open-multinet/playground-rspecs-ontology
cleanup
cleanup
fixed partOfFederation domain/range
auto-layout
irreflexive properties
asymmetrix properties
irreflexive/asymmetrix properties
added comments
added RDFa example
added more information
restructuring a bit
layout