Added commands to cd into a castle and to open a shell and to open the

default editor in the root of a given castle.

lib/homesick.rb

@@ -239,6 +239,31 @@ class Homesick < Thor
 
   end
 
+  desc "cd CASTLE", "Open a new shell in the root of the given castle"
+  def cd(castle = DEFAULT_CASTLE_NAME)
+    check_castle_existance castle, "cd"
+    castle_dir = repos_dir.join(castle)
+    say_status "cd #{castle_dir.realpath}", "Opening a new shell in castle '#{castle}'. To return to the original one exit from the new shell.", :green
+    inside castle_dir do
+      system(ENV['SHELL'])
+    end
+  end
+
+  desc "open CASTLE", "Open your default editor in the root of the given castle"
+  def open(castle = DEFAULT_CASTLE_NAME)
+    if ! ENV['EDITOR']
+      say_status :error,"The $EDITOR environment variable must be set to use this command", :red
+
+      exit(1)
+    end
+    check_castle_existance castle, "open"
+    castle_dir = repos_dir.join(castle)
+    say_status "#{ENV['EDITOR']} #{castle_dir.realpath}", "Opening the root directory of castle '#{castle}' in editor '#{ENV['EDITOR']}'.", :green
+    inside castle_dir do
+      system(ENV['EDITOR'])
+    end
+  end
+
   protected
 
   def home_dir