Multimedia: Optimized the YouTube player closed captions logic
Multimedia: Used the YouTube API getIframe instead of undocumented variable
Also used clearer variable names
Multimedia: Show the duration of YouTube video on load instead of on play
Merge pull request #6033 from LaurentGoderre/improve-youtube

Improve youtube
Multimedia: Fixed the scaling of the YouTube player and Flash Fallback
Merge pull request #6034 from LaurentGoderre/improve-youtube

Multimedia: Fixed the scaling of the YouTube player and Flash Fallback
Theme/Dismissible alerts: Fixed avalanche of broken links.
Merge pull request #6036 from EricDunsworth/v4.0-broken-link-fixes

Theme/Dismissible alerts: Fixed avalanche of broken links.
Tabs: Enabled nesting of tabs

Fixes #6038
Merge pull request #6041 from pjackson28/fixnestedtabs

Tabs: Enabled nesting of tabs
Build: Updated autoprefixer
Multimedia: Fix the share buttons
Merge pull request #6051 from LaurentGoderre/fix-multimedia-share

Multimedia: Fix the share buttons
Merge pull request #6045 from LaurentGoderre/update-deps

Build: Updated autoprefixer
Geomap: Fixing examples by temporarily excluding them from minification
Multimedia: Converted the YouTube player to chromeless
Captions in HTML5 and chromeless mode did not work. However the issue was fixed by the YouTube team
Merge pull request #6058 from LaurentGoderre/fix-geomap-demo-temp

Geomap: Fixing examples by temporarily excluding them from minification
Merge pull request #6059 from LaurentGoderre/multimedia-youtube-chromeless

Multimedia: Converted the YouTube player to chromeless
Geomap: Converting 'Locate' images to sprite
Merge pull request #6057 from LaurentGoderre/geomap-sprites

Geomap: Converting 'Locate' images to sprite