Update _border-radius.scss

http://caniuse.com/#search=border-radius
Update _box-sizing.scss

http://css-tricks.com/box-sizing/
(see end of this article)
Update _box-shadow.scss

https://developer.mozilla.org/en-US/docs/Web/CSS/box-shadow?redirectlocale=en-US&redirectslug=CSS%2Fbox-shadow
Update _user-select.scss

Prefixed properties must be before the normal-state property.
Merge remote-tracking branch 'origin/pr/579' into develop

* origin/pr/579:
  Update _border-radius.scss
Merge remote-tracking branch 'origin/pr/580' into develop

* origin/pr/580:
  Update _box-sizing.scss
Merge remote-tracking branch 'origin/pr/581' into develop

* origin/pr/581:
  Update _box-shadow.scss
Merge remote-tracking branch 'origin/pr/582' into develop

* origin/pr/582:
  Update _user-select.scss