Applying some organizational changes on the Requisitions UI (Grunt, JSHint, Dist)

I finally decided to organize and fix the JSHint warnings, and make Grunt happy for the Requisitions UI, in preparation of the future merging of the JavaScript dependencies.

I centralized all the common jshint settings on .jshintrc and added the personalized ones directly on some JS files; besides applying the remaining fixes based on the suggestions I got from jshint.

Also, I fixed the default tasks on Gruntfile.js in order to create a minimized version of the templates and the custom code for the requisitions UI. I'm not planning to use that at the moment, I just wanted to be able to run "grunt" without parameters and everything is built properly until the end without errors or warning.

IMPORTANT: There are no significant changes on the JavaScript files or the HTML Templates of the Angular Code for Requisitions. Only the changes required to make JSHint happy have been applied.