Web customizer still shows deprecated @screen-xs and @screen-phone
Created by: fulldecent
Page is: http://getbootstrap.com/customize/#media-queries-breakpoints
These variables are deprecated since 3.0.1 per https://github.com/twbs/bootstrap/blob/master/less/variables.less#L263-L268
(Original note from @brejoc on stackexchange https://stackoverflow.com/questions/18424798/twitter-bootstrap-3-how-to-use-media-queries/18850777?noredirect=1#comment35328440_18850777)