release/0.7

Without the ntriples package published, the sesame or the jena packages don't work, as they now have a dependency on ntriples. 

I wonder if this is a reason for #183 "publish banana" taking so long to reach the main maven repositories.

Also I wonder if this is not a reason to have a test suite that just runs the example packages after the others have been published, just to see if they can be run. Ie that would be a way of fullfilling #170 "examples project needs to be turned into test suites" in a useful way. 1. publish the main repo. Then run the example project in a way as to have it depend purely on the published jars.