fix .vagrant/butcher not existing in vagrant-aws
Move include to where it makes the most sense
Merge pull request #33 from scalp42/guest_cache_key_path_fix

fix .vagrant/butcher not existing in vagrant-aws
Delete only the key that we created (fix #35)
Fix create and remove cache dir
Bump version for release
Create key from contents instead of copying the file to a shared folder

This will fix #34 and allow the plugin to be used on remote (not local
VMs) providers where shared folders are not available.
Remove unused exception code
Do not create key file unless the cat command was successful
Bump version for publishing
Reduce code complexity by removing unused logic
Merge branch 'feature/remote_providers' (fix #34)
Compute cache directory relative to Vagrantfile location (fix #32)
Release version
Fix / add specs
Implement rough butcher command