added experiments.txt and qTables

fixed shell script
using wall clock time instead of processor time

started with qlearning implementations

  contains only logic from snake game, works with shield

# Conflicts:
#	Shield/graph_from_map.py

map icons

  - option to change speeds
  - option to change length
  - names of snakes
  - function to detect if pos(x,y) is on or after crossing
  - little ui changes

added buttons to toggle shield, user can now control snake despite shield but it gets overwritten if input would lead to crash