Fix preexisting tests after adding default hooks

lib/guard.rb

@@ -59,8 +59,9 @@ module Guard
     # fire it if his work leads to a system failure
     def supervised_task(guard, task_to_supervise, *args)
       guard.hook "#{task_to_supervise.to_s}_begin"
-      guard.send(task_to_supervise, *args)
+      result = guard.send(task_to_supervise, *args)
       guard.hook "#{task_to_supervise.to_s}_end"
+      result
     rescue Exception
       UI.error("#{guard.class.name} guard failed to achieve its <#{task_to_supervise.to_s}> command: #{$!}")
       ::Guard.guards.delete guard

lib/guard/guard.rb

@@ -1,5 +1,6 @@
 module Guard
   class Guard
+    include Hook
 
     attr_accessor :watchers, :options
 

spec/guard_spec.rb

@@ -107,6 +107,8 @@ describe Guard do
           failing_result.message.should == 'I break your system'
         end
       end
+
+      it "calls the default hooks"
     end
 
     describe ".locate_guard" do