Use minified Bootstrap
Removed unused respond.js
Removed HTML5 shim/shiv

Removed as no HTML5 elements exist in the theme.
Tidy up of zhtml files

Changes include:
 - Fixed missing tags
 - Removed chrome frame support as it is discontinued
 - Improved consistency between login.ztml and master.ztml
 - Better formatting
 - Removed some meta data (bots shouldn't be in control panel anyway)
 - ...and so on