Ability to add remote poster and thumbnails to a video#19

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nickedwards wants to merge 2 commits intobrightcove:masterfrom

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Commits on Sep 20, 2016

ability to add remote poster and thumbnails to a video
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Commits on Oct 21, 2016

Allow null values to be sent through the API. This is required for API functionality e.g. for schedule start_date and end_date
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