Revert es6-promise dependency to 2.x.

es6-promise 3.x has auto-polyfill behavior which we want to avoid.

Author: davidlehn

CHANGELOG.md

@@ -2,6 +2,9 @@
 
 ## [Unreleased]
 
+### Fixed
+- Revert es6-promise dependency to 2.x to avoid auto-polyfill behavior.
+
 ## [0.4.7] - 2016-04-14
 
 ### Fixed

bower.json

@@ -8,7 +8,7 @@
   "license": "BSD",
   "main": ["js/jsonld.js"],
   "dependencies": {
-    "es6-promise": "^3.0.0"
+    "es6-promise": "^2.0.0"
   },
   "ignore": [
     "node_modules",

package.json

@@ -25,7 +25,7 @@
   "license": "BSD-3-Clause",
   "main": "js/jsonld.js",
   "dependencies": {
-    "es6-promise": "^3.0.0",
+    "es6-promise": "^2.0.0",
     "pkginfo": "~0.4.0",
     "request": "^2.61.0",
     "xmldom": "0.1.19"