close #3531 added focus handling and removed the badly announced "times"...

close #3531 added focus handling and removed the badly announced "times" close button from screenreaders

Use ref instead of label when checking branches in issue-guidelines

Add 'dist' directory to .gitignore

update button styles to use updated 14px base font size, align carets to others with no opacity changes

Allows you to keep a 'dist' directory in the repository as a target build location.
This can be useful if you have bootstrap as a submodule in a project and want to build it,
but still keep it self-contained. Similar to how jQuery does their default builds:
https://github.com/jquery/jquery/#how-to-build-your-own-jquery