Update less/mixins.less

horizontal three color gradient added
fixes jankiness with anchor tags in carousel.
its not dyslexic being easy.
lets see how much i can mess this pull request up. :|
removes anchor tag definition.
Fixing inline lists for IE7
Merge pull request #6776 from ndabas/fix-inline-lists-ie7

Fix inline lists for IE7
add horizontal-three-color gradient test
Merge branch 'dospuntocero-master' into 2.3.0-wip
Merge branch '2.3.0-wip' of github.com:twitter/bootstrap into 2.3.0-wip
Merge pull request #6763 from rjregenold/2.3.0-wip

fixes jankiness with anchor tags in carousel.
Add changelog file to repo instead of relying on the wiki
Merge branch '2.3.0-wip' of github.com:twitter/bootstrap into 2.3.0-wip
Fixes #6794: incorrect docs mention of th element
Fixes #6794: incorrect docs mention of th element
Merge branch '2.3.0-wip' into 3.0.0-wip

Conflicts:
	docs/assets/css/bootstrap.css
	less/type.less
Remove base-css.html after recent merges
Forgot to remove base-css.mustache
Add justified button groups for link buttons; reorganize dropdowns and button groups docs sections
Increase margins and line-height on h3; overhaul button dropdown docs