External library updates in 4.6

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The following are external libraries that have been updated during the 4.6 release cycle.

Masonry

Masonry was updated to version 3.3.2 from version 3.1.4 (#32802). Notable changes:

jQuery events are now triggered.
CommonJS is supported.
Percentages can now be used for horizontal positions.
Various browser compatibility issues are now resolved.

Full Changelog: https://github.com/desandro/masonry/releases

imagesLoaded

imagesLoaded was updated to version 3.2.0 from version 3.1.4 (#32802). Notable changes:

Background images are now supported.
setTimeout no longer triggers multiple events errantly.
Internal cache has been removed. Each image will now be checked.
Various browser compatibility issues are now resolved.

Full Changelog: https://github.com/desandro/imagesloaded/releases

NOTE: imagesLoaded and Masonry are now in separate files. This means that imagesLoaded can be enqueued without Masonry being enqueued. For backward compatibility reasons, imagesLoaded remains a dependency for Masonry.

MediaElement.js

MediaElement.js was updated to version 2.22.0 from version 2.18.1 (#36759, #37363). Notable changes:

Several YouTube embed issues have been resolved.
More Vimeo APIAPI An API or Application Programming Interface is a software intermediary that allows programs to interact with each other and share data in limited, clearly defined ways. support added.
A few a11yAccessibility Accessibility (commonly shortened to a11y) refers to the design of products, devices, services, or environments for people with disabilities. The concept of accessible design ensures both “direct access” (i.e. unassisted) and “indirect access” meaning compatibility with a person’s assistive technology (for example, computer screen readers). (https://en.wikipedia.org/wiki/Accessibility) and i18ni18n Internationalization, or the act of writing and preparing code to be fully translatable into other languages. Also see localization. Often written with a lowercase i so it is not confused with a lowercase L or the numeral 1. Often an acquired skill. issues have been fixed.
General stability enhancements.

Full Changelog: https://github.com/johndyer/mediaelement/blob/2.22.0/changelog.md

TinyMCE

TinyMCE was updated to version 4.4.1 from version 4.3.10 (#37225, #37327, #37476). Notable changes:

Various contentEditable bugs fixed.
Various browser compatibility bugs fixed.
General stability and performance enhancements.

Full Changelog: https://github.com/tinymce/tinymce/blob/4.4.1/changelog.txt

Backbone.js

Backbone.js was updated to version 1.3.3 from 1.2.3 (#37099). Notable changes:

4 major regressions were fixed.
Added findIndex and findLastIndex Underscore methods to Collection.
Added options.changes to Collection “update” event which includes added, merged, and removed models.
Removed component package support.

Full Changelog: https://cdn.rawgit.com/jashkenas/backbone/1.3.3/index.html#changelog

#4-6, #dev-notes, #external-libraries