Parlour integration

Not yet for commit.

This how I anticipate the integration working, I'm just not sure the best way to make sure the sqoop job is used as a dependency yet.

I can pass in a tap/source to the Import/ExportSqoopJob, but I'm not entirely sure how scalding will match it up with what gets used in the load.

hm.
I don't know that much about sqoop options, but my initial thoughts would be that:
 - the standard sqoop upload function probably should just give the user a few parameters to fill in. I imagine there is a standard set of parameters that are all that is required for most use cases.
 - a custom sqoop upload can then allow the user to pass in whatever arbitrary sqoop options they like.