new version of 32bit v8
new d8 with readline capability
repl script
REPL yeah!
accidentally commited this
behaves even better.

Removes print statements from blocks of code that don't define anything.
Better error locating prints code sofar and marks the line with the
error.
Cleanup and some comments.
Allow print statements.
Cheeky quit().
quit and exit fixed but SystemExit would be even better

Only print if result is not none and don't nag about empty line
catch SystemExit to quit