action: Global refactoring

1) 'CheckAccessible' deleted, because Parallels VMs can not have "inaccessible" state
2) 'CheckParallels' deleted, because it is implemented by "Provider#usable?" method
3) Machine's state checking is implemented via built-in middleware:
  'CheckRunning', 'CheckCreated', 'Created', 'IsRunning', 'IsSuspended'
  have been replaced with 'Vagrant::Buintin::IsState'
4) Message printing is implemented via built-in middleware:
  'MessageAlreadyRunning', 'MessageNotRunning', 'MesageNotCreated', 'MessageWillNotDestroy'
  have been replaced with 'Vagrant::Buintin::Message'
guest_cap: Fixed typo in the cabability name
driver: removed 'verify!' method (not in use).
action: Added 'is_driver_version' middleware
guest_cap: Fixed typo in the cabability name
driver: Refactoring. Modified 'execute' method. Added 'execute_prlctl' & 'execute_prlsrvctl' wrappers
errors: Renamed 'PrlCtlError' -> 'ExecutionError'
errors: Fixed text for 'mac_os_x_required' error
driver: Added 'read_guest_tools_iso_path' method
action: 'CheckGuestTools' replaced with 'HandleGuestTools'

'HandleGuestTools' supports checking and installing/updating guest tools as well
guest_cap: Added "install_parallels_tools" capability for linux guests [GH-70]
action/set_power_consumption: Removed PD version checking.

Use 'IsDriverVersion' middleware instead.
errors: Text for 'VMImportFailure' customized.

Default message from vagrant contains a virtualbox-specific phrase
Version bumped to v1.1.0
Release v1.1.0

* master:
  errors: Text for 'VMImportFailure' customized.
  action/set_power_consumption: Removed PD version checking.
  guest_cap: Added "install_parallels_tools" capability for linux guests [GH-70]
  action: 'CheckGuestTools' replaced with 'HandleGuestTools'
  driver: Added 'read_guest_tools_iso_path' method
  errors: Fixed text for 'mac_os_x_required' error
  errors: Renamed 'PrlCtlError' -> 'ExecutionError'
  driver: Refactoring. Modified 'execute' method. Added 'execute_prlctl' & 'execute_prlsrvctl' wrappers
  guest_cap: Fixed typo in the cabability name
  action: Added 'is_driver_version' middleware
  driver: removed 'verify!' method (not in use).
  guest_cap: Fixed typo in the cabability name
  action: Global refactoring