shootaroo/jit-grunt — pull request #2 by shinnn (2013-12-22 14:30:47+00:00)
Title: Fix loaded task checking

At present, *jit-grunt* fails to load the plugin [grunt-contrib-concat](https://github.com/gruntjs/grunt-contrib-concat), because the array of loaded task names contains `concat` in its prototype and *jit-grunt* regards `concat` task as already loaded.
So I introduced `indexOf` to check if an array has a value without fail.