Vagrantfile now using setup-depencies.sh

The current Vagrantfile did not work for me, and had two obvious bugs.

I took the precise-enabled setup-dependencies.sh script from PR #54, and adapted the Vagrantfile to use the setupscript, and added some minor info at the end of "vagrant up".

* The mount point for the ooniprobe dir has been changed to /usr/share/ooni to be closer to the sample config
* make geoip now doesnt fail if executed twice
* documented two open issues and the workaround in the vagrantfile

This PR includes the setup-dependencies.sh from #54.