version bumped to 1.0.4
Added a goingDaysBack attribute, which will dynamically calculate a value for publishedAfter. (Also, publishedBefore/publishedAfter weren't being included in API requests.)
Fixes to ensure that we don't make duplicate API requests.
Added demo that searches for historic videos in the British Pathé channel.
Added comments to clarify some of the changes.
Merge pull request #15 from GoogleWebComponents/1.0.4

Fixes for multiple requests, and added goingBackDays parameter