backports: Make it clear that it will only be extracted to a separate gem if theres enough interest
:bomb: hand made sanity checks (vagrant-spec is coming in!)
core: Getting ready to run vagrant-spec acceptance suite
core: Fix synced folder creation (AKA first bug caught with vagrant-spec)

Thanks @mitchellh!
Minor tweaks to accomodate acceptance specs
backports: Alias 1.5 new Vagrant::UI::Interface methods
backports: Alias HandleBoxUrl to HandleBox
backports: Add Action::Message
core: Get the plugin to work on Vagrant 1.4 nicely
core: Enable paralelization for Vagrant 1.2+ only
We dont need to provide support for all versions on the 1.1.x series ;)