move alias registration into a separate register() method

lib/vagrant/alias.rb

@@ -15,6 +15,18 @@ module Vagrant
           # separate keyword-command pairs
           keyword, command = line.split("=").collect(&:strip)
 
+          register(keyword, command)
+        end
+      end
+    end
+
+    # This returns all the registered alias commands.
+    def commands
+      @aliases
+    end
+
+    # This registers an alias.
+    def register(keyword, command)
       @aliases.register(keyword.to_sym) do
         lambda do |args|
           # directly execute shell commands
@@ -28,9 +40,3 @@ module Vagrant
     end
   end
 end
-
-    def commands
-      @aliases
-    end
-  end
-end