Release Name: 0.5.0

Notes:
Improved visualization for model relationships.
Support for plugins models.
Support for hidding Rails magic fields
Support for acts_as_state_machine diagrams
Support for irregular inflexions
Minor bugfixes


Changes:
- Changed model relationships representation (feature request #10898)
- Added support for plugins models (-p) (feature request #12742 by
  Chris Richards). Thanks to Elliot Smith.
- Added support for irregular inflexions (from patch #12384). Thanks
  to Juan Ignacio Pumarino.
- Added hidding of magic fields (--hide-magic) (from patch #13351)
  Thanks to Hajime Baba.
- Added -r option to set the application root path (request #12801).
- The -e flag now requires full path to excluded files.
- Added support for state machine diagram ("acts as state machine" plugin).
  Thanks to Ana Nelson (she did all the work!).