Update bootstrap files to 3.1.1
Change class names to match bootstrap v3.
Add show/hide charts toggle.
Change overlay background colour to an auspicious number. Reduce whitespace between update times and show/hide button. Fill out opacity calculation function.
Make show/hide charts button a bit smaller.
Add additional background image and carousel to support it.
Add machu picchu background pic.
Remove unused update of pm25-conc div. Get overlay opacity from AQI value instead of PSI value.
Merge branch 'localhost'