added license information

Change-Id: I3843117e9d194985b7fc451df70c95b5302154c1
updated license information

Change-Id: I490b201a6d5c094013599ccf7bc87da246da7d67
Added .nt and .trix as supported extensions for OWL editor.

Change-Id: I7d202a736bdfdae7ea3caf2b59a38616f9ef0784