Prepare for WP directory submission
Change help popup to inline
Styling for new inline documentation popup
Fix inline help tab
Don't load help styles outside admin
Add support and documentation for images

Closes #33
Fix styling in help tab popup
Add support for, document Progress Bars

Closes #36
Add, document Page Header

Update emphasis to use <span> rather than <p>
Add Page Header to close #39
Make documentation popup a little prettier
Improve list-groups, offer more options

Add linked list-groups, active parameter, list-group-heading, and
list-group-text shortcodes. Closes #27
Implement, document button dropdowns

Closes #34
Documentation
Extra spaces in documentation
Add, document breadcrumbs. Closes #35
Add, document button-toolbar; general cleanup

Closes #40.
General code cleanup, consistency
Documentation
Add, document navs. Closes #38

Also changed collapse “active” parameter to be more consistent with the
similar parameters in other shortcodes
Remove "strong" parameter from Alerts

This should be handled in the wrapped content.
Allow arbitrary classes in columns, closes #25
Merge pull request #42 from filipstefansson/dev