Tweak test_dryad script

Specifies false for both test switches (skipTests and maven.test.skip)
Cleans build when running tests
Correct typo
Merge pull request #25 from datadryad/group-vars-typo

Correct typo
added xvfb and firefox packages to dryad_deps.yml for doing headless selenium tests in vm
Merge pull request #27 from rnathanday/headless-pkgs

Add xvfb and firefox package dependencies for headless testing
Prevent the VM from filling with useless backups

With each build, remove the previous backup. The build will backup the
current installation, so one backup is always retained.

If the earlier (and mostly useless) backups are not removed, the VM
will eventually run out of disk space.
Merge pull request #28 from datadryad/minimize-backups

Prevent the VM from filling with useless backups
added synced_folder entries to Vagrantfile

Added two config.vm.synced_folder entries to enable a couple of useful
guest directories to be available from the host system.

This config does not create any directories on the host or guest system,
so before 'vagrant up' is run, the host directories (./sync/...) must be
created. Vagrant warns and exits if the local directories are not present.
enable synced folders only for virtualbox; gitignore sync folders

Updated synced folder config to be enabled only for virtualbox
provider. Added "sync/" entry to .gitignore.
added synced_folder entries to Vagrantfile

Added two config.vm.synced_folder entries to enable a couple of useful
guest directories to be available from the host system.

This config does not create any directories on the host or guest system,
so before 'vagrant up' is run, the host directories (./sync/...) must be
created. Vagrant warns and exits if the local directories are not present.
merging upstream/master
merged into upstream/master; updated README to mention VirtualBox syncing; fixed VirtualBox sync override config
add accept_hostkey flag for cloning dryad repo
Merge branch 'git-accept-hostkey' of github.com:rnathanday/vagrant-dryad into git-accept-hostkey