Re-implemented all development Rake tasks in Thor. Now actually tested.

Fixes:
* https://www.pivotaltracker.com/story/show/25484287 & https://github.com/pivotal/jasmine/issues/183
* https://www.pivotaltracker.com/story/show/25485401 & https://github.com/pivotal/jasmine/issues/189
* https://www.pivotaltracker.com/story/show/25485953 & https://github.com/pivotal/jasmine/issues/159

spec/tasks/jshint_spec.rb

@@ -0,0 +1,39 @@
+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