propel:form:generate --originName Option

When I use JSMSerializer it converts objects like

    {"some_field": "value"}

but form type for it contain fields with names in camel style like someField. In this case I'd like to have option to generate form type with original names. That's why I added --originName option.

Also I refactor little bit hole class. I added _input and _output properties, so we can use arguments and options of command in any method, not only in execute()