is disabled by default and must be enabled

The plugin must now be explicitly be enabled to support not having to uninstall the plugin when not using berkshelf
output warning if disabled and berksfile exists
Merge pull request #16 from danshultz/plugin-disabled

A way to enable/disable plugin
cleanup spacing issues from #11
add tests to config for plugin disabled from #11
refactor middleware actions

cleaner way of passing over middleware from changes in #16
minor refactor for berksfile exists but disabled warning message
Merge pull request #18 from RiotGames/refactor-actions

refactor middleware actions
clarify that the path a berksfile was found at was configured by you
update usage documentation to reflect enable/disable
version bump 1.1.0
Fix multi-vm setups

Simplify provisioner list fetching. It seems that this also fixes #4.