should we use class: Todo instead of type: Todo in param declaration

[sollycatprint]

From @catmando on February 29, 2016 20:54

In writing documentation I realize we are at odds with Ruby terminology here.

Should we allow "class:" as an alias for "type:" in Param declarations?

If so should we eventually deprecate type?

Copied from original issue: zetachang/react.rb#131

[catmando]

@zetachang - I think we should at least offer class: as alternative to type:

[zetachang]

Agreed on this. But the original inspiration is from https://github.com/ruby-grape/grape#supported-parameter-types , have no idea why they choose "type" instead of "class".