alphabetical sorting of metadata tree elements
added project file browsing
refactored metadata tree in a separate package. added type resolution for RDF literals while rendering
included reverse relations into the metadata tree - with fixes
excluded logger from metadata service
removed file browsing
renamed files in the metadata tree package
draft of the table to display metadata literals
moved tree - table coupling to the main controller
excluded literals from the tree
refactored metadata source files
refactored table item
refactored root tree items creation
Merge pull request #18 from stoewer/master

Resources: fix problem with resources dirs
merged master
added test for tree controller
refactored test resources to FakeRDFmodel
bugfix in tree filtering
Merge pull request #19 from asobolev/master

Draft of the table with metadata literals + some refactoring

There was just this small comment about code style, so I merged it.
Menu: show project menu and entry for settings

- Add a new menu called 'Project' to the menu bar
- The project menu appears only if a project is open
- The menu contains an entry that shows the project settings dialog