Conversion of RGBA to RGB in order to save .jpg images

[mhubrich]

Some of the static maps returned by the Google Maps API are in RGBA mode. These images cannot be saved as .jpg files.

How to replicate this issue:

• Delete the cache folder (/mapscache/)
• Run the example.py script
• Observe the following error message:

  File "/home/mhubrich/GooMPy/goompy/__init__.py", line 78, in _grab_tile
  tile.save(filename)
  File "/usr/local/lib/python2.7/dist-packages/PIL/Image.py", line 1930, in save
  save_handler(self, fp, filename)
  File "/usr/local/lib/python2.7/dist-packages/PIL/JpegImagePlugin.py", line 607, in _save
  raise IOError("cannot write mode %s as JPEG" % im.mode)
  IOError: cannot write mode RGBA as JPEG