Mobile Web App Fixes

Various fixes from
http://www.luster.io/blog/9-29-14-mobile-web-checklist.html have been
added, namely:

# -webkit-tap-highlight-color
# iOS webapp title auto suggest meta tag
# Meta viewport tag updated with better defaults
# IE Mobile cleartype meta tag
# Android home screen icon added + meta tag
# Apple touch icons turned to solid black placeholders