better way to align center, this way can align even the element is hiding
Update spin.js
Release v2.0.0
Spinner must now always be invoked as constructor
update jshint settings
center using top/left 50%

and default to absolute positioning
update year in copyright notice
document release workflow
update position in example code to 2.0 defaults
fix for positioning without target
Merge pull request #219 from tablatronix/master

fix for positioning without target
update change log
Release v2.0.1
fixed syntax error
Merge pull request #238 from zjx20/patch-1

fixed syntax error