Fix issue #382: TypeError with TransposedFont's getsize()

When getting the size of text with a TransposedFont it was failing:

  File "/usr/local/lib/python2.7/site-packages/PIL/ImageDraw.py", line 281, in textsize
    return font.getsize(text)
  File "/usr/local/lib/python2.7/site-packages/PIL/ImageFont.py", line 189, in getsize
    w, h = self.font.getsize(text)[0]
TypeError: 'int' object is not iterable

This is because self.font.getsize(text) returns a (w, h) tuple. To fix, remove the [0].

Test cases have been created in test_imagefont.py: 
test_rotated_transposed_font()
test_unrotated_transposed_font()

Both fail before the fix, both pass with the fix. Furthermore, the code I'm using this from ( https://github.com/mattdeboard/word_cloud ) now works as expected and creates a word cloud similar to the ones that PIL created.

PIL/ImageFont.py

@@ -171,7 +171,7 @@ class TransposedFont:
         self.orientation = orientation # any 'transpose' argument, or None
 
     def getsize(self, text):
-        w, h = self.font.getsize(text)[0]
+        w, h = self.font.getsize(text)
         if self.orientation in (Image.ROTATE_90, Image.ROTATE_270):
             return h, w
         return w, h