Add rake console

Change-Id: Ib4a2bd69af923eaebefcd94f9e44b9db10058f2b

Author: John Hawthorn

Rakefile

@@ -1 +1,13 @@
 require "bundler/gem_tasks"
+
+desc 'Open an pry (or irb) session'
+task :console do
+  begin
+    require 'pry'
+    sh 'pry -Ilib -romc'
+  rescue LoadError => _
+    sh 'irb -rubygems -Ilib -romc'
+  end
+end
+
+task c: :console