Additional heading font-size classes

Created by: stilliard

It would help people to keep the font sizes on there site more consistent is classes were also offered as the same sizes as the the headings. E.g. bits of text that semantically are not headings, but for styling purposes should appear the same size, or are different levels in the document structure.

The change would just be to add classes next to the headings in /less/type.less

h1, .h1 { font-size: (@font-size-base * 2.75); font-size: 4rem; } // ~38px
h2, .h2 { font-size: (@font-size-base * 2.25); font-size: 3rem; } // ~32px
h3, .h3 { font-size: (@font-size-base * 1.75); font-size: 2.5rem; } // ~24px
h4, .h4 { font-size: (@font-size-base * 1.25); font-size: 2rem; } // ~18px
h5, .h5 { font-size:  @font-size-base; font-size: 1.6rem; }
h6, .h6 { font-size: (@font-size-base * 0.85); font-size: 1.2rem; } // ~12px

I can open the pull request, but mainly wondered about what naming style would be best.

So i also found this issue from 6 months ago but its now closed, https://github.com/twitter/bootstrap/issues/5203 But i don't think it was clear the first time with this issue that it could help the consistency between font sizes on the site, and that it would not only be useful for heading tags, but for any text on a page.