Spread attribute support and small optimizations.

Conflicts:
	acorn.js
	docs/acorn.html
	package.json
	test/tests.js

test/run.js

@@ -1,6 +1,7 @@
 var driver = require("./driver.js");
 require("./tests.js");
 require("./tests-harmony.js");
+require("./tests-jsx.js");
 
 var testsRun = 0, failed = 0;
 function report(state, code, message) {

test/tests.js

@@ -6,7 +6,6 @@ if (typeof exports != "undefined") {
   var testFail = require("./driver.js").testFail;
   var testAssert = require("./driver.js").testAssert;
   var acorn = require("..");
-  require("./tests-jsx.js");
 }
 
 test("this\n", {