metadata tree - first draft
parsing ontology files to render in the metadata tree
split metadata service items into schema, annotations and inferred model
built tree with ontology
refactored RDFTreeItem
added simple test for MetadataTree controller
small clean-up
added annotations to the metadata tree
Merge pull request #14 from asobolev/master

First draft of the metadata tree

OK, but check comments
ProjectListView: working view and controller
Merge branch 'master' of github.com:G-Node/gndata-editor