Initial bouncing_ball projects, untested.
print_framebuffer() now clears screen and uses "." for 0
Added missing gitignore files
Merge branch 'master' into dev/bsilverman/bouncing_ball

Conflicts:
	Makefile
	rstem/led2/led_driver.c
bouncing_ball: projects 1-4, untested.

Separate did writeups of apps, for review.
Merge branch 'master' into dev/bsilverman/bouncing_ball

Conflicts:
	Makefile