Boosted alpha.6 - based on Bootstrap alpha.6 latest release before the Beta

This latest alpha is not a minor update. Boostrap drops IE9 support and has rewriten many components to use flexbox.
We have merged as fast as possible all these evolutions and after more than 150 commits we're happy to deliver this version.

Before upgrading your version, please take a look at the Bootstrap alpha.6 release note and shiplist : https://github.com/twbs/bootstrap/releases/tag/v4.0.0-alpha.6

This release contains some bugs due to Bootstrap alpha.6.

• Bugs that have been patched in Boosted :
  • Dropdown : Consistent line height in dropdown => PR bootstrap twbs/bootstrap#21622
  • Accordions : aria attribute error=> Issue twbs/bootstrap#21635
  • Btn-toolbar: Btn-group in btn-toolbar doesn’t fit to the available space on mobile view => Issue twbs/bootstrap#21699 (Fix in boosted add flex-wrap class to all btn-toolbar)
  • Nav-tabs : Doesn't fit to container mobile view => We’ve chosen to hide items on mobile view in boosted
  • Dropdown : dropdown-backdrop used for touch screen enlarge the clicked area also on firefox ESR
  • Enable-rounded : Variable wasn't taken into account for all rounded css
  • Box-shadow : Variable wasn't taken in account for all shadow, we’ve removed hard coded shadow
• Bugs identified, but not fixed at publication time :
  • Input group: http://v4-alpha.getbootstrap.com/components/input-group/#segmented-buttons bug bootstrap segmented buttons twbs/bootstrap#21593
  • Tables : hover and striped value for inverse background, issue : twbs/bootstrap#21676
  • Tooltip : http://v4-alpha.getbootstrap.com/components/modal/#tooltips-and-popovers tooltip and popover don’t work in modals => Issue : twbs/bootstrap#21613
  • Carousel : http://v4-alpha.getbootstrap.com/components/carousel/ image doesn't fit the full carousel width
  • Dropdown: http://v4-alpha.getbootstrap.com//components/navs/#tabs-with-dropdowns inside a navbar, dropdown icon sometimes breaks on small viewport

Here is our changelog :

Bug Fixes

• accordion:
  • update accordion classes following alpha.6, and merge boosted specific documenta (8de10d34)
  • update accordion classes following alpha.6, and merge boosted specific documenta (a151643e)
• button:
  • ensure that link within a paragraph with .btn class are not underline (b81d028a)
  • ensure that link within a paragraph with .btn class are not underline (7dac3604)
• buttons:
  • remove buttons focus shadow (823809b2)
  • remove buttons focus shadow (658c0526)
• component:
  • buttons (3f3fe1e9)
  • footer (8a3263d3)
  • tables (e05a5ea5)
  • tags (dc0bdb8b)
  • navbar (b4a97940)
  • o-list (f027f6db)
  • navbar (5c5ca055)
  • buttons (dff90f86)
  • forms (f66bd126)
  • scrollspy (9a629857)
  • local navigation (b5791660)
  • carousel (6802892c)
  • carousel (174a1d6c)
  • navbar (ae9bd644)
  • buttons (64a03317)
  • forms (e7cbaa95)
  • scrollspy (51b7195a)
  • local navigation (9bb1a928)
  • carousel (5ef3648b)
  • carousel (47291968)
  • navbar (6cc35f38)
• custom-select: update custom select size to match all other form components (0ac2166a)
• dropdown:
  • fix dropdown-menu overlay (dd5604e3)
  • remove margin on nav-divider (53f81fe8)
  • update dropdown scss following alpha.6 merge (15ff9db6)
  • following alpha.6 update, fix dropdown item padding (b600b2ad)
  • fix dropdown-menu overlay (db842938)
  • remove margin on nav-divider (1af1e526)
  • update dropdown scss following alpha.6 merge (6b57ac52)
  • following alpha.6 update, fix dropdown item padding (7ef49b86)
• forms: update the spacing between two form groups (3f0eaedc)
• grid:
  • Fix merge error onto the grid padding (d74821ad)
  • Fix merge error onto the grid padding (ad6b24ed)
• links:
  • put back the underline option for link inside a paragraph (lost during merge) (a35f9478)
  • put back the underline option for link inside a paragraph (lost during merge) (8cac5f22)
• navbar:
  • fix documentation duplicate ID errors (c62e5553)
  • fix documentation duplicate ID errors (8f40a2d1)
• pagination:
  • following alpha.6 merge fix pagination Boosted custom definitions and sizes (9a0bf375)
  • following alpha.6 merge fix pagination Boosted custom definitions and sizes (cbd6c70f)
• progress: update progressbar font-size new var in bootstrap Alpha.6 impact on the progress (406f8b31)
• scroll-up:
  • replace fadein and fadeout effect by hide and show classic function, becaus jque (83bfae46)
  • replace fadein and fadeout effect by hide and show classic function, becaus jque (1bc462ce)