scope styles to masthead, not homepage
Merge branch 'master' of github.com:twbs/bootstrap
don't be repetitive on homepage
expo callout copy
remove confusing comment
add @navbar-collapse-max-height Less variable
reorder sections of About docs page

most folks are probably more interested in History and Team than Branding
remove default left-right print margins per upstream h5bp change

Refs:
    https://github.com/h5bp/html5-boilerplate/commit/57be193031b95b003b96efe9eba7a4db7f58f4e1
    https://github.com/h5bp/html5-boilerplate/issues/1477
Merge pull request #12327 from twbs/about-ordering

reorder sections of About docs page
Merge pull request #12326 from twbs/navbar-var

add @navbar-collapse-max-height Less variable
Reorder nav of About docs page
Reorder lead info of About docs page
Merge pull request #12334 from Quy/master

Reorder lead/nav of About docs page
update browserstack runner package
Gone, gone.
Merge pull request #12340 from browserstack/update_bs_runner

Update browserstack-runner package
No more lists.
enable IE11 in BrowserStack tests
add docs note to address #12078
Merge pull request #12345 from twbs/printer-wackiness-note

add note about printer viewport weirdness