Grunt: Add JSHint support.
Fix JSHint warnings.
Enable JS strict mode
Fixes #285
Enable `curly` rule.
Enable `forin` and `freeze` rules.
Enable `newcap` and `latedef` and remove `laxbreak` and `validthis`.
Enable `immed`, remove `boss` and move `bitwise` to fingerblast.js.
Run `grunt`.