Use gemfile for plugin configuration in development
Update dependencies, add vagrant-spec acceptance tests

- Update to vagrant 1.6
- Update to rubydns pre 0.8.0 release
- Add vagrant-spec acceptance test

May thanks to adrienthebo/vagrant-auto_network for a good working sample on how to use vagrant-spec!
Re-Add create system files using sudo

New optional parameter `--with-sudo` enables old behavior for `--install`, `--uninstall` and `--purge` (executing a `sudo` shell command).
ref #18, #26

Also cleaning up the Command to let the Installer purge.
Add testdrive for manual testing/playing
0.6.0 first beta
Fix acceptance specs when VAGRANT_DEFAULT_PROVIDER is set
test for latest 1.6er vagrant by default
update rubydns dependency to 0.8.4

run test with latest rubydns (master)
0.6.0 2nd beta
Update change log with 0.6.0.bata1
re-add lost option to run ontop
Update to rubydns to v0.9.0
update changelog
Merge pull request #35 from BerlinVagrant/dev-0.6

pull together changes for 0.6