Move generic code into commands and virtualbox-specific code to new class
Ignore bundler directories
Enable loading support for different providers
Pass machine to session class
Fix variable in error message
Use i18n for error messages
Add libvirt support
Handle exceptions during libvirt operations
Reverting snapshot while vm is running requires force parameter due to qemu bug
Merge pull request #27 from sciurus/libvirt

Add support for vagrant-libvirt
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