Clarify Windows workarounds.
Use variables for breadcrumb padding
Merge pull request #11839 from XhmikosR/readme

Clarify Windows workarounds.
Merge pull request #11841 from ZDroid/breadcrumbs

Use variables for breadcrumb padding
Fixes #11837: grid containers are fixed width now, no longer max-width
Merge branch 'master' of github.com:twbs/bootstrap