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

tasks/jasmine_dev/count_specs.rb

@@ -0,0 +1,29 @@
+class JasmineDev < Thor
+
+  desc "count_specs", "Count the number of specs for each test runner"
+  def count_specs
+    say JasmineDev.spacer
+    say "Counting specs...", :cyan
+
+    core_spec_count = count_specs_in(File.join('spec', 'core'))
+    console_spec_count = count_specs_in(File.join('spec', 'console'))
+    html_spec_count = count_specs_in(File.join('spec', 'html'))
+
+    say "#{(core_spec_count + console_spec_count).to_s} ", :yellow
+    say "specs for Node.js runner (exclude DOM-related specs)"
+    say "#{(core_spec_count + console_spec_count + html_spec_count).to_s} ", :yellow
+    say "specs for Browser runner (all specs)"
+    say "\n"
+    say "Please verify that these numbers match the runner output."
+  end
+
+  no_tasks do
+    def count_specs_in(relative_path)
+      files = Dir.glob(File.join(JasmineDev.project_root, relative_path, '*.js'))
+      files.inject(0) do |count, file|
+        File.read(file).scan(/\sit\s*\(/) { |s| count += 1 }
+        count
+      end
+    end
+  end
+end