Lassie

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- Added a default fake user agent to use instead of using python-requests/version (some websites will mark certain user agents as bot attempts)
- Updated requests to 2.13.0

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- Fix Python 3 support
- Handle empty AMP image lists

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- Handle AMP image list of strings vs list of objects

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- Handle AMP data that is contained in a list
- Retrieve videos and thumbnails (as images) from AMP VideoObjects

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- Fix issue where AMP images could be lists inside an object

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- Fix issue where some keys returned (i.e. description) would not be retrieved if the key existed with an empty value already