Readme: Added more tips for recording test-cases
Vagrantfile: Download real-world test data repo during provisioning.
Readme: Added more recording tips.
Vagrantfile: export LD_LIBRARY_PATH=/usr/local/lib (for vigra)
towards a testable carving: install carving dependencies
potential fix for installing cylemon
make carving workflow run

A 'vagrant up' will run the script defined in Vagrantfile
as the user root. Therefore, sudo's are not required everywhere;
instead, after the initial setup change to the user vagrant.
This solves the problem that cython was not installed in the
virtualenv. Also, it makes chown calls unnecessary.
Vagrantfile: Init submodules in lazyflow
Major changes.  Don't install prereqs to system.  Clone ilastik-build-Linux instead.