Add Slide Numbers

Add slide status element to the footer bar so viewers can keep track of
their position.
Integrate with Google Analytics upon slide transition
Add loading spinners while slides load.
Cacheable endpoints
Merge branch 'dev' of github.com:alorum/seoslides into dev

Conflicts:
	js/seoslides_front.min.js
	readme.txt
Make sure YouTube videos auto-stop
Auto-pause videos
Loading Indicator

Move away from hotswapping navigation with indicators to adding a
modal-style loading indicator.
Hide navigation on mobile
Gracefully handle > 64MB imports
Update for WordPress 3.9 compatibility
Height and Width in Embed

Allow editors to specify the height/width of embeds.  In the shortcode,
this us used with standard height/width parameters.  In the script embed,
these are specified with data-height/data-width attributes.  Both are
intended to be integers.
Fix Remove Media bug
Shrink whitespace around loading indicator and fix orb positioning
Fix duplicate slide titles.
Changelog
Version bump for release
Merging 1.5 release