removing the last traces of half-assignments. Issue #541.

src/coffee-script.coffee

@@ -30,7 +30,7 @@ lexer = new Lexer
 # Compile a string of CoffeeScript code to JavaScript, using the Coffee/Jison
 # compiler.
 exports.compile = compile = (code, options) ->
-  options = or {}
+  options or= {}
   try
     (parser.parse lexer.tokenize code).compile options
   catch err