Started porting JSX support from esprima-fb.

Conflicts:
	acorn.js
	test/tests.js

test/tests-jsx.js

@@ -0,0 +1,53 @@
+// React JSX tests
+
+if (typeof exports != "undefined") {
+  var test = require("./driver.js").test;
+  var testFail = require("./driver.js").testFail;
+  var testAssert = require("./driver.js").testAssert;
+}
+
+test('<a />', {
+  type: 'Program',
+  body: [
+    {
+      type: "ExpressionStatement",
+      expression: {
+        type: "XJSElement",
+        openingElement: {
+          type: "XJSOpeningElement",
+          name: {
+            type: "XJSIdentifier",
+            name: "a",
+            start: 1,
+            end: 2,
+            loc: {
+              start: { line: 1, column: 1 },
+              end: { line: 1, column: 2 }
+            }
+          },
+          selfClosing: true,
+          attributes: [],
+          start: 0,
+          end: 5,
+          loc: {
+            start: { line: 1, column: 0 },
+            end: { line: 1, column: 5 }
+          }
+        },
+        children: [],
+        start: 0,
+        end: 5,
+        loc: {
+          start: { line: 1, column: 0 },
+          end: { line: 1, column: 5 }
+        }
+      },
+      start: 0,
+      end: 5,
+      loc: {
+        start: { line: 1, column: 0 },
+        end: { line: 1, column: 5 }
+      }
+    }
+  ]
+}, {locations: true});

test/tests.js

@@ -6,6 +6,7 @@ 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", {