- new vars for .lead size and weight (previously had none)
- new var for default margin-bottom on h1-h6 elements (previously had none)
- rearranged vars to combine two typography sections into one in variables.scss
- reassigned border-width var to hr-border-width
- made hr-border more specific as hr-border-color

Use grid classes or mixins on .dl-horizontal, update docs to include it, removes auto truncate and makes .text-overflow mixin into a .text-truncate class and mixin combo for better granularity

New text align class, .text-nowrap, for preventing text from breaking to new lines. Applies it to the grid docs table.

Transform text in components with text capitalization classes.

For better readability on mobile devices

Flagged upstream in bootstrap-sass by scss-lint