* master: (67 commits)
  Applying package updates.
  Revert ChoiceGroup change in 5.0 to minimize potential partner impact. (microsoft#4962)
  Applying package updates.
  ChoiceGroup: getStyles conversion (microsoft#4852)
  Export SASS variables and mixins (microsoft#4959)
  Variants: update algorithm (microsoft#4949)
  Allow for customization of keycodes that cause the focus rect to appear (microsoft#4948)
  Mergestyles facepile (microsoft#4950)
  Fixing circular dependency and non-AMD references in ContextualMenu (microsoft#4946)
  Clean up semantic slots (microsoft#4932)
  Added missing merge-styles background-size typing (microsoft#4935)
  Applying package updates.
  Split menu button styles (microsoft#4922)
  Experimental Chiclet Component (microsoft#4678)
  Remove hover and pressed background colors (microsoft#4908)
  Remove @cschleiden as Rating code owner (microsoft#4929)
  Addressing Issue microsoft#3691 - SplitButton: In Safari, the SplitButton has mismatched heights (microsoft#4797)
  Applying package updates.
  Adding option for focus on tags in disabled picker (microsoft#4833)
  Jest merge-styles serialization fix for animation-name (microsoft#4927)
  ...

* master: (85 commits)
  Applying package updates.
  Shimmer: refactor in preparation for migration to OUFR (microsoft#4958)
  Applying package updates.
  Theming: fix error colors (microsoft#4969)
  MaskedTextField: Added event callback passthrough (microsoft#4956)
  Experiments/Nav component: Enable auto expand until the next manual expand disables the auto expand (microsoft#4996)
  Applying package updates.
  Experiments/Nav component: Auto select/expand based on the selectedKey prop (microsoft#4984)
  StickyPane: fix Array.from in Ie (microsoft#4982)
  ContextualMenu has aria-labelledBy referencing element not in DOM (microsoft#4963)
  Keyboard support for the slim version of experiments/Nav component and added aria attributes (microsoft#4981)
  Move ghdocs to wiki (microsoft#4977)
  Remove build artifacts (microsoft#4976)
  Revisited the Multi-select Combo box initial state selection fix (microsoft#4884)
  Applying package updates.
  readme cleanup (microsoft#4972)
  Theming: add the bodyBackgroundDarker semantic slot (microsoft#4957)
  Improvements for auto-select opt-in mode (microsoft#4914)
  Applying package updates.
  Revert ChoiceGroup change in 5.0 to minimize potential partner impact. (microsoft#4962)
  ...