Add ray_caster, ray generator, painter.
Finished painter and built a test run
fixed typo
Tkinter pixel drawer.
More debugging
Merge remote-tracking branch 'origin/master'

Conflicts:
	painter.py
	ray_caster.py
Merge remote-tracking branch 'origin/master'
Fixes.
Workingish?
fixed test_arena
Tweaks.
resolved merge conflicts with ivan
further merge conflict resolution
fixed weird issues from merge
cleanup after major debugging; corrected fish-eye perspective
Removed another print statement, renamed painter to slice_generator, moved vector to its own module
fixed indentation
ported to pygame
made game rotate view
added movement, although not very cleanly...