Add camera.py
  - Move camera functions into separate file for better modularity.
  - Uses 'picamera' module to handle camera functions.
Uses custom 'camera.py' module in replace of the 'picamera' module
  - Replaces custom camera functions in place of what was the 'picamera' function to help modularity.
Change reference to 'camera' module to simply 'cam'.
  - Change the import of 'camera' to reference 'cam' for clarity.