Ajax link and button with loading effect

Integration for http://msurguy.github.io/ladda-bootstrap/
I'm not sure how well msurguy manage the releases.
https://github.com/msurguy/ladda-bootstrap/releases has a single release from Nov 18 2013.
The files I copied from the dist/ folder are 2 months old.
I think it is OK to use the resources without webjars for now.