Add tabs to make docs more end-user readable
New modal for documentation popup

Now uses a Bootstrap modal rather than Thickbox for the modal popup.
This makes us a little more future-proof (WordPress is retiring Thickbox
eventually) and cleans up some overflow issues some uses were
experiencing at certain resolutions.

Also cleaned up the documentation a little, added "back to top" links,
and removed the title and plugin description from the body of the
documentation.

By necessity updated the included version of Bootstrap which styles the
help.
Cleaner styling for the new modal
More common handle for Bootstrap js
Less conflicty names for tabs in documentation
Friendlier tab names in popup
Friendlier name for shortcode reference
Fix active tab
Less conflicty anchor names in help popup
Update README.md
Update readme.html
Fix [carousel] indicators with help from mebdev
Add, document new responsive utilities in Bootstrap 3.2
Fix help HTML name
Experimental nested shortcodes using "row-2", "column-2" etc. 10 levels of potential depth.
Move nested shortcodes to their own branch for now
Move nested shortcodes to their own branch for now
Check for the word "true" when processing an ostensibly boolean paramenter
Fix bugs with back-to-top link in documentation
Version number