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/count_specs_spec.rb

@@ -0,0 +1,26 @@
+require 'spec_helper.rb'
+
+describe "Spec counting task" do
+
+  let(:jasmine_dev) { JasmineDev.new }
+
+  before do
+    @output = capture_output { jasmine_dev.count_specs }
+  end
+
+  it "should tell the developer that the specs are being counted" do
+    @output.should match(/Counting specs/)
+  end
+
+  it "should report the number of specs that will run in node" do
+    @output.should match(/\d+ \e\[0mspecs for Node.js/)
+  end
+
+  it "should report the number of specs that will run in the browser" do
+    @output.should match(/\d+ \e\[0mspecs for Browser/)
+  end
+
+  it "should remind the developer to check the count" do
+    @output.should match(/Please verify/)
+  end
+end