Switched slideshow from flex to responsive.  #1557

Just some markup, js, and a library.  No biggie.
Slideshow: edit slide tpl markup to mimc HC's template.#1557
Use HappyCog's secretly patched responsiveslides.  #1557

Now the markup matches.
Slideshow code cleanup.  #1557

Removed extraneous comments, javascript.
Slideshow class names prepended with layout_ #1557

@dancabral, this should fix the css class names.
OS slideshow based on responseslide script. Made minor changes to tpl file(s) in order to mimic HC's template. Added slideshow base from HC css and create 3 out of 4 slideshow styles. #1557
Copied imagefield_crop patch into slideshow branch.  #1557
OS Slideshow: add css for all 4 slideshow styles.#1557
Merge pull request #1736 from openscholar/1557-responsiveslides

1557 responsiveslides