multi-line expressions (sort of)

if you type this:
`> (define (f x)`
and then hit enter, it will show a new prompt.
Then you can finish the expression after that:
`> (define (f x)
>   x)
> (f 1)
1`
Merge pull request #2 from AlexKnauth/try-muli-line

multi-line expressions (sort of)
Revert "multi-line expressions (sort of)"
Merge pull request #3 from jarcane/revert-2-try-muli-line

Revert "multi-line expressions (sort of)"
Update home.html
Revised documentation and templates

I guess I'm sorta in charge of this thing now, so I've changed some of
the docs and templates to reflect this.
Added sandbox-memory-limit parameter to make-ev.

Hopefully this should fix the memory crashes.