Bootstrap: Bump to 3.0.3

Fixes gh-3768
Merge pull request #3907 from nschonni/v4-bump-bootstrap-303

Bootstrap: Bump to 3.0.3
Share widget: Fixed RTL support
Merge pull request #3908 from pjackson28/sharewidgetrtl

Share widget: Fixed RTL support
Overlay: Left and right panels now display on right and left respectively when dir=rtl
Merge pull request #3909 from pjackson28/overlayrtl

Overlay: Left and right panels now display on right and left respectively when dir=rtl
Multimedia: Implemented closed captions for the youtube player
Multimedia: enabled the progress bar polyfill
Optimized plugin triggers
Merge pull request #3913 from LaurentGoderre/v4-multimedia-progress-polyfill

Multimedia: enabled the progress bar polyfill
Merge pull request #3911 from pjackson28/shortensometriggers

Optimized plugin triggers
Merge pull request #3912 from LaurentGoderre/v4-multimedia-youtube-fix

Multimedia: Implemented closed captions for the youtube player
GRUNT: Corrected font copy path to new TBootstrap file structure
Merge pull request #3916 from masterbee/gruntpatch

GRUNT: Corrected font copy path to the new TBootstrap file structure
Lightbox: Changed lb- and -lb to lbx- and -lbx
Merge pull request #3918 from pjackson28/changewblbtowblbx

Lightbox: Changed lb- and -lb to lbx- and -lbx
Overlay/Archived: Prevented content from overlapping close button (fixes #3603)
Merge pull request #3919 from pjackson28/fixoverlayclosespacing

Overlay/Archived: Prevented content from overlapping close button (fixes #3603)
Removed Bootstrap outline overrides
Merge pull request #3920 from pjackson28/removebootstrapoutlineoverrides

Removed Bootstrap outline overrides