BUG 11632 "Se puede saltar pasos sin verificar si existen..." SOLVED

- You can skip steps without check for required fields, this in
  option Steps
- Solved problem, add validation in option Steps, we have used
  the same criteria of the event that launches when you click on
  the link "Next Step"
* Available from version ProcessMaker-2.5.1-testing.2
FEATURE: Adding Real MVC Support for plugins
FEATURE: Adding Real MVC Support for plugins - Adding some plugin data into cotroller object and fixing a error when the controller action not found
Merge pull request #1812 from victorsl/BUG-11632

BUG 11632 "Se puede saltar pasos sin verificar si existen..." SOLVED
FIX: Litle fix to allow load any css file from plugins