Multiple VideoFiles are now made available for
Video instances, rather than having a single set of fields
on the Video class.
Removed vidscraper.utils.http since the single function there
was unrelated to HTTP, was only used by a single suite, and was of
questionable usefulness period.
Added support for testing with tox.
Added vidscraper-cmd for shell access to the api.
Replaced video pickling support with simple video serialization.