Initial markup and styles for mobile

  + add images
Merge branch 'develop' of github.com:sankynet/sankyinc.com into develop

Conflicts:
	source/index.html.erb

Solved conflicts - ensured new markup is in place
Add slider and set styles for mobile

  + using swiper jquery plugin
  + http://www.idangero.us/sliders/swiper/index.php
Add functionality for nav menu overlay

  + add scroll functionality for
    downward arrow on front page