Bug Squashing & a few minor improvements

Mainly bug squashing!!

• Player animations had disappeared following addition of character selection - sorted
• Dog bark following eating final piece of food had disappeared - missing line of code - sorted
• No default character meant that if you did not choose one, you had no player on-screen - now there is a default

Also a few little additions/improvements:

• Included quit button on game screen so you can easily return to title screen
• German Shepherds now rotate to the direction they are moving
• Updated title screen - character select now includes images with selected one highlighted

Enjoy!  :)