Changeset 31373

Split the media JS files into modules:

• Add a new folder in wp-includes/js, media
• Create manifest files for views, models, grid, and audio-video
• Make browserify an npm dependency
• Add Grunt tasks for browserify and uglify:media on build and watch
• Update the paths loaded for media files in script-loader
• All new files were created using svn cp from their original location

Please run npm install. While developing media JS, you must run grunt watch.

See #28510.