Enabled logging, added memory limits.

Attempting to confine the sandboxes better to prevent the persistent
memory crashes.
Merge remote-tracking branch 'origin/master'

Conflicts:
	main.rkt
Fixing namespace misuse
Namespace attempt 2.
Namespace attempt 3?
The continuing adventures of Namespace Man
Falling back to requires
Typo in make-evaluator.
Corrected some incorrect code examples
Fixed extra parens in local binding tutorial
Fixed missing parens in local binding tutorial
changed "slideshow/flash" in example to pict/flash
Few more corrections to the tutorial text