refactoring: add & use .text-emphasis-variant() mixin
add & use @modal-md Less var for uniformity
remove border radius when it's not both ends in panel
Merge branch 'master' into text-emphasis-variant
Merge branch 'master' into modal-md
Merge pull request #12247 from twbs/text-emphasis-variant

refactoring: add & use .text-emphasis-variant() mixin
Merge pull request #12249 from twbs/modal-md

add & use @modal-md Less var for uniformity
Merge pull request #12286 from watilde/fixes-panel

Fixes #12263: Remove border radius when it's not both ends in panel
Merge branch 'master' into bg-variant

Conflicts:
	less/mixins.less
Run grunt dist after adding 'a' requirement to the text emphasis classes