Fix require php_markdown
Create and document Thumbnails shortcode
Add Emphasis classes shortcode
Responsive utilities shortcode
Rename fix shortcode function
If responsive element isn't wrapped

If it's not wrapped in a tag, wrap it in a <p> tag.
Modal

Added optional "data" attribute to the Button shortcode to accomidate
modals
Adjustments to data attributes, popovers.
Clarity
Add optional targets to buttons
Replace regex with domDocument, update docs
Proper popover shortcode.

Popover still possible from buttons using data- properties.
Documentation
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Documentation layout
Break update prompt
Merge pull request #28 from FoolsRun/bootstrap3

Add Thumbnails, Emphasis classes, Responsive utilities, Modals, Popovers, Fix require php_markdown

Thanks for the contribution.  Sorry its been a bit slow on the merge, been busy this end