RCFileLocalScheme to run on local

[jeremieSimon]

Hi there,

First, thanks for the good work.

I wanted to add support for RCFile on local for scalding.
So basically, I wanted to create a class like this RCFileLocalScheme extends Scheme <...>
so that we can override the localScheme of the RCFile class in the ColumnarSerDeSource.

Would that interest you?

[branky]

Thanks, looking forward your commits.