Update grunt-contrib-concat to 0.4.0, grunt-contrib-jshint to 0.10.0 and grunt-dev-update to 0.5.6 in package.json.
Update grunt-contrib-concat to 0.4.0, grunt-contrib-jshint to 0.10.0 and grunt-dev-update to 0.5.6 in package.json.

davidensinger/webworke.rs,davidensinger/webworke.rs,davidensinger/webworke.rs