fixed initialization sequence

Hi Adafruit!  Please see this thread with all of the people having issues making the Winstar 16x2 OLED Character display work correctly.  Everyone was getting an "ax   ax" on their screens.  Turns out there was just a little issue with the initialization sequence.  Please see the full explanation of these changes here http://forums.adafruit.com/viewtopic.php?f=22&t=42179&p=218812#p218812

Now perhaps this will be fine going forward, but I have no way to test this with older displays that presumably worked with this library.  Hopefully it is backwards compatible.