Build: Add Autoprefixer

- Removed manual prefixing in SCSS
- Some previous prefixes will not be in the final CSS now that the
browser support matrix was up'd
- Cleaned up whitespacing and indenting in SCSS files
Improved the plugins msic file inclusion logic
Added logic for plugins assets (images, binaries etc..)
Merge pull request #3034 from LaurentGoderre/grunt-plugins-improvments

Switch the misc task to exclusion instead of inclusion and added logic for plugins assets
Merge pull request #3029 from nschonni/v4-autoprefixer

Build: Add Autoprefixer
Build: Copy Bower files for Debug target

Fixed the dependencies not being copied to the dist folder in the debug target
Vapour improvements and Micro tempting addition
* Included a new vapour object that will carry tombstone data of the wet-architecture for plugins that requires some path locations for templates and assets
* Added a tinytim with modifications - secure micro tempting helper function
Progress on Multimedia player
Cached the document object in multiple plugins.
Merge pull request #3036 from masterbee/helper-templater

Vapour improvements and Micro templating addition
Merge pull request #3037 from pjackson28/cachedocument

Cached the document object in multiple plugins.
Removed extraneous presentation properties from %accessible-invisible-show.
Reduced extraneous presentation CSS for the skip link functionality down to the class .wb-skip-link which should be applied directly to each skip link instead of a container and only toggles the display of the skip links on focus.
Updated the layout templates to use the new skip-link CSS.
Moved the presentation CSS properties for the skip links to the theme.
Eliminated the use of important in the accessible-invisible CSS.
Removed duplication of presentation CSS for :link and :visited for the skip link CSS.
Styling the mediaplayer
Globally cached document object and then used for locally caching in plugins
Merge pull request #3043 from pjackson28/documentglobalcache

Globally cached document object and then used for locally caching in plugins