Add thor spec

Thorfile

@@ -1,6 +1,19 @@
+require 'rubygems'
 require 'appium_thor'
 
 Appium::Thor::Config.set do
   gem_name 'angular_webdriver'
   github_owner 'bootstraponline'
-end
+end
+
+# Must use '::' otherwise Default will point to Thor::Sandbox::Default
+# Debug by calling Thor::Base.subclass_files via Pry
+#
+# https://github.com/erikhuda/thor/issues/484
+#
+class ::Default < Thor
+  desc 'spec', 'Run RSpec tests'
+  def spec
+    exec 'rspec spec'
+  end
+end