Action 'SetName' added
'actions.rb' refactoring

- while destroy: added 'ProvisionerCleanup' call, removed 'UnregisterTemplate' call
- while up: 'HandleBoxUrl' is called more early
- added states for 'WaitForCommunicator'
'config.rb': _detected_errors usage added
Refactoring of actions 'Import', 'Export' and 'Package'
Added shortcuts for setting the CPU count and memory size [GH-71]
Gemfile ang gemspec updated

1) Repo URL changed
2) Bundle version updated
3) Unnecessary gems deleted
Version bumped to 0.2.1
Action 'CheckGuestTools': text notice added
'synced_folder': output methods changed