Changes:
- merges fix for progress bar issue on player close
- rewrite subtitle parser to use json3
- combining 5 cues into single es document for more efficient indexing
* Replaced isWatched() function.
* Switched to `updateVideoWatchStatus()` function
* Updated Onclick to `updateVideoWatchStatus(this)`
* Handle `this` input in `updateVideoWatchStatus()`
* Reduce API calls
* Fix video id
* Updated `createVideoTag()` description.
* Fixed URL used for cast integration
* Check video duration
* Updates progress bar on watched and close.
* Set progress bar width to 0% by default
* Cleanup, function descriptions
* Cleanup console logging
* Update progress bar on cast progress every 10s
* Catch short <30s videos and mark as watched
* Added cast integration docs.
* Changed header sizes.
* Added more space above Requirements
* Added cast integration docs.
* Removed separate cast integration docs
* Further indented quote from Google
* Switch to HTML based video position.
* Ground work for API changes and video progress
* Added onpause attribute to video.
* Added save video progress feature.
* Added API check for subtitle status.
* Switch method to DELETE if position is 0
* Added `createVideoTag()` function
* Added `InsertVideoTag()` function
* Switch to JS generated video tag, add on page load
* Removed extra data from DELETE request
* Removed unused code
* Reduced duplicate code
* Cleanup & groundwork cast pull metadata from API
* Minor bug fix
* Fix saving video progress on player close.
* Only send video progress when unwatched
* Cleanup
* Added `getURL()` function
* Cast use API & save progress/mark as watched
* Added cast progress checks
* Changed thresholds for marking videos as watched
* Added `watchedThreshold()` function
