Update INSTALL.md
Add a rudimentary RDF export command
Add a crude benchmark script to test gid vs index batch retrieval
Quicky patch to prevent crash to #27
Encapsulate a user's inherited global permissions as its own class to
make building and handling easier (at the expense of verbosity.)
Encapsulate inherited item permissions as their own class.
General cleanup and method parameter reordering
Merge branch 'master' into acl_graph