S3 Media Maestro 4.6.0

* Fix: Fixed issue with adding alt tag within the S3 Media Maestro shortcode builder modal
* Tweak: Modified the forward/backward keyboard shortcuts to advance video by 10 seconds
* New: Add additional video speed for 50%

* Fix: Issue where GuzzeHTTP was not using new namespace.
* Fix: Fixed a warning message for Elastic Transcoder.

* Fix: Updated namespacing for Guzzel to prevent conflicting Guzzel packages

* Tweak: Updated the updater class to make API call to license server more efficient
* New: Added slower speeds to player
* New: Added Chromecast button to player

* Fix: Fixed transcoding issue where default role/policy wasn't created with rook access keys
* Fix: Fixed issue where non-video files were attempting to be transcoded
* Fix: Fixed issue where audio shortcode was including video quality parameter
* Fix: Fixed guzzle conflict with multiple plugins