Merge branch 'develop' into in-memory-initialization

* develop:
rangeslider.js badge links to the project page
Build dist files
Insert generated DOM after the input range element
Don't visually hide the input range element
Defines a `:focus` state for $rangeslider__handle
Adds a `:active` state for $rangeslider__handle
$rangeslider__handle box-shadow improvement
Improves border-radius definition
Removes unnecessary border definition
Adds $rangeslider vars for selectors

Conflicts:
dist/rangeslider.min.js