Bugfix: time_travel_to now works fine with DateTime

Fixes: bebanjo#5

lib/delorean.rb

@@ -38,7 +38,7 @@ def reset
 
   def mock_current_time(time, options={})
     time = Chronic.parse(time, options) if time.is_a?(String)
-    time = Time.local(time.year, time.month, time.day) if time.is_a?(Date)
+    time = Time.local(time.year, time.month, time.day) if time.is_a?(Date) && !time.is_a?(DateTime)
 
     time_travel_offsets.push Time.now - time
   end

spec/delorean_spec.rb

@@ -41,6 +41,13 @@
         'Back in good old 1955.'
       end.should eql 'Back in good old 1955.'
     end
+
+    it "should work with DateTime" do
+      datetime = DateTime.strptime("2011-05-25 18:00", "%Y-%m-%d %H:%M")
+      Delorean.time_travel_to(datetime) do
+        Time.now.should be_close(datetime, 1)
+      end
+    end
   end
 
   describe "back_to_the_present" do