Enhance RB.BaseResource to enable uploading multiple files at once.

Review Request #4258 — Created June 24, 2013 and submitted — Latest diff uploaded

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master

Reviewers

Enhance RB.BaseResource to enable uploading multiple files at once.

BaseResource had a lot of code for handling file uploads through the API, but it
only supported uploading a single file per request. This change generalizes that
to handle uploading any number of files.
Ran unit tests.