[PATCH] Add LiveScript support with generalized "Dialect" enum about plv8 HOT 7 CLOSED

Looks fantastic!  Can you elaborate on what LiveScript is here?

Sure! It's an improvement over CoffeeScript with Perl and Haskell influences: 
http://gkz.github.com/LiveScript/

See http://gkz.github.com/LiveScript/blog/powerful-jquery-with-livescript.html 
for how it simplifies many cases of common tasks in javascript idioms.

Finally I found time to look at this.  It's very straightforward and could be 
applied soon, but I wonder if we could generalize more, so that tens of dialect 
can be easily supported without loosing control...

https://github.com/jashkenas/coffee-script/wiki/List-of-languages-that-compile-t
o-JS

Well, let's merge this for now and I'll offer to make the generalization when 
the next popular dialect comes in? :-)

I'll do so.  But I will probably change the way to build it.  One idea is have 
the macro be ENABLE_DIALECT to build all at once rather than specifying each 
dialect, because the reason I separate it is the size of shared object, and one 
that wants to build a dialect presumably doesn't care it anymore.

Applied with a little fix.  Thanks for contribution!