Merge pull request #1225 from LaurentGoderre/v3.0

Fixed issue #1172 by stripping images from the ajaxed HTML captions
Multimedia.js: Minor spacing fix
Removed checking against h1 text in navcurrent handling. Done to avoid problems with duplicate text but different URLs.
Updated details/summary polyfill to 0.1.0. Corrected polyfill loading for details/summary. Removed unnecessary polyfill update calls (only needed for progress). Remove meter polyfill reference because not supported until v3.1.
Committed updated details/summary polyfill file.
Restored polyfill update calls because will be used by wb_load in post-enhancement scenario.
Reverted to previous version without v3.1 code.
Merge branch 'v3.0' of github.com:wet-boew/wet-boew into v3.0
Reverted to previous pe-ap.js version without v3.1 code.
Added content gutter for Lightbox inline and AJAXed content when in Moble view. Cleaned up the SCSS. Reduced the flicker of the captions (jumps to the top) when transitioning between boxes.
Removed unnecessary hide JS from Lightbox since now handled with CSS only.
Removed unnecessary reveal JS from Lightbox since now handled with CSS only.