Adding jshint task to fix possible errors shown in the console output, better indentation of js code and update the grunt-contrib-stylus dependence

[Blackskyliner]

Just my opinion on this, I would have split this in at least 3 commits. One changing the CodeStyle on all current files and one adding jshint as dependency and one updating the grunt-contrib dependency, to be more atomic and also to better "see" what was done. (This would also keep the commit messages somewhat smaller) It would also make later reasoning about changes somewhat more pleasant.

[maxmx]

Too large to merge and not worthwhile to do for BS3.

Also I much prefer eslint, might include it in BS4 stylus.

[ghost]

Thanks for the tips @Blackskyliner and @maxmx, with the upcoming release of the BS4 is not feasible to merge, I did not know ESLint is even better.