For unix vs windows development. Make sure to use appropriate variable from config file when creating engine in model.py
Changes for compatibility with windows 8, Switched to using jpgs instead of pngs. using rb and wb to read/write binary image data. Need to test if changes still work with OSX.
create_engine now uses a variable from my config.py file to determine which postgres info to use. remember to switch to the appropriate variable for the current dev machine.