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

spec/tasks/jshint_spec.rb

@@ -1,39 +0,0 @@
-require 'spec_helper.rb'
-
-describe "JSHint task" do
-
-  let(:tmp_dir) { "#{Dir.tmpdir}/jasmine_tasks_test" }
-  let(:jasmine_dev) { JasmineDev.new }
-
-  before do
-    reset_dir tmp_dir
-  end
-
-  describe "when Node is not present" do
-    before do
-      jasmine_dev.should_receive(:has_node?).and_return(false)
-      @output = capture_output { jasmine_dev.js_hint }
-    end
-
-    it "should not tell the user that lint is running" do
-      @output.should_not match(/Running JSHint/)
-    end
-
-    it "should prompt the user to install Node" do
-      @output.should match(/Node\.js is required/)
-    end
-  end
-
-  describe "when Node is present" do
-    before do
-      jasmine_dev.should_receive(:has_node?).and_return(true)
-
-      @output = capture_output { jasmine_dev.js_hint }
-    end
-
-    it "should tell the user that lint is running" do
-      @output.should match(/Running JSHint/)
-      @output.should match(/Jasmine JSHint PASSED/)
-    end
-  end
-end