Merge pull request #1255 from larvata/1.0-checkbox-disable-fix

misspell in checkbox enable/disable method name
Fixes #1256, issues with offsetParent as 'html', should account for padding added to  'body'
Remove input blur on selection, breaks tabbing in webkit based browsers #1253
Rebuild dist #1256
Adds global header sizes for h1-h6, reorganizes site.variables based around work in site ui docs
Header UI now inherits from site.variables
Vertical list sizes are now relative
Messages are now relative em
Simplify logic with parent context
Remove paragraph font size, not necessary, can cause inheritance issues
Sort out global variables to be in intuitive order and match definition, move font loading to theme.config (this means users might need to re-install)
Material design defaults
Fix description spacing without meta on item
Error message variables, popup
UI Header inherits header font weight
Add variables for basic text colors
Update github theme
Rebuild dist
fix: the enable/disable method does not act correctly