Added grunt to project.

Move from embedded "fork" of jsHint to using grunt's jsHint module.
Cleaned ALL jsHint errors.
Added jasmine.util.isUndefined as alternative to extra careful protection against undefined clobbering

tasks/jasmine_dev/build_distribution.rb

@@ -2,8 +2,6 @@ class JasmineDev < Thor
 
   desc "build_distribution", "Build Jasmine js & css files"
   def build_distribution(directory = "./lib/jasmine-core")
-    invoke :js_hint
-
     say JasmineDev.spacer
 
     say "Building Jasmine distribution from source into #{directory}", :cyan