defmacro in Node complained about "LiScript is not defined"

Tested with the newly added example.js,
Node complained about "LiScript is not defined"
for the LiScript used in defmacro definition.

Also tested for Try-LiScript, by removing LiScript
in defmacro and defreader's definition the program
works the same.

Not sure if that's because of the scoping or if that's
the best/correct fix.

Btw, Node requires *exports* in liscript.js,
any way to work around this so one file supports
both Node and browsers?