TODO
====

Short Term
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* Reimplement as Abstract Base Class.
* Allow an output directory to be specified.
* Unbind the filename from the Video class, to allow graceful file renaming.
* Throw custom exceptions.
* Detect duplicate video encoding options, preventing the creation of identical
    video class instances. (can cause get() method to raise unnecessary
    multiple returned excepion).

Long Term
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* OS Compatibility testing of automatic filename generation.
* Improve automatic filename generation.
* Add functionality for batch URL processing.
* Scrape and inject additional video information into metadata.