Revert "Add and document jumbotron"

This reverts commit e12f61a777b400c12ea46db27fbcecaabe8d4200.
Update documentation
Fix class autoloading for php_markdown
Spelling
Merge remote-tracking branch 'origin/jumbotron' into help-tab

Conflicts:
	README.md
Revert "Merge remote-tracking branch 'origin/jumbotron' into help-tab"

This reverts commit fb9fff0d74a1940f4fbcb283fd05774f9e020332, reversing
changes made to 59f8fa5fd86bb1074f3937c6f58bd20d1709f85f.
Housekeeping
Housekeeping
Merge branch 'jumbotron' into Working
Working copy
Make jumbotron title optional
Example insert buttons
Styling
Open external links in new tab/window
Merge branch 'Working' of github.com:FoolsRun/bootstrap-shortcodes into bootstrap3-pull27

Conflicts:
	includes/bootstrap-shortcodes-help.php
Cherry pick the commit that was removed from #26