add reference finder (not working).
limit print string length, otherwise too hard to read.
add --sourcemap.
ongoing debugger support work (not working at all...)

Right now it tries to use "node debug" [*1] but it's not likely going to work.
I think I'll switch to direct access to v8 debugger on TCP connection [*2].

[*1] http://nodejs.org/api/debugger.html
[*2] http://code.google.com/p/v8/wiki/DebuggerProtocol