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/version_spec.rb

@@ -0,0 +1,55 @@
+require 'spec_helper.rb'
+
+describe "Version tasks" do
+
+  let(:jasmine_dev) { JasmineDev.new }
+
+  describe "write_version_files" do
+
+    before do
+      @output = capture_output { jasmine_dev.write_version_files }
+    end
+
+    it "should tell the user that the task has started" do
+      @output.should match(/Building version files/)
+    end
+
+    it "should build the version.js file" do 
+      js_version = File.read(File.join(project_root, 'src', 'version.js'))
+      js_version.should match(%Q{"build": #{jasmine_version_object["build"]}})
+      js_version.should match(%Q{"minor": #{jasmine_version_object["minor"]}})
+      js_version.should match(%Q{"build": #{jasmine_version_object["build"]}})
+
+      if jasmine_version_object["release_candidate"]
+        js_version.should match(%Q{"rc:" #{jasmine_version_object["release_candidate"]}})
+      end
+
+      js_version.should match(/"revision": \d+/)
+    end
+    
+    it "should build the jasmine-core ruby gem version" do
+      ruby_version = File.read(File.join(project_root, 'lib', 'jasmine-core', 'version.rb'))
+      ruby_version.should match(%Q{VERSION = "#{jasmine_version}"})
+    end
+  end
+
+  describe "display_version" do
+    describe "when Node.js is not present" do
+      before do
+        @output = capture_output { jasmine_dev.display_version }
+      end
+
+      it "should display a version header" do
+        @output.should match(/Current version/)
+      end
+
+      it "should display the current version Object" do
+        @output.should match(/Display version: \e\[33m\d+\.\d+\.\d+/)
+      end
+
+      it "should display the current version string" do
+        @output.should match(/\{ "major": \d+, "minor": \d+, "build": \d+/)
+      end
+    end
+  end
+end