Merge pull request #336 from cslarson/whenEnvIsLoaded

don't wait for DOMContentLoaded if it's already fired

lib/contracts/code_templates/define-when-env-loaded.js.ejs

@@ -1,5 +1,5 @@
 var whenEnvIsLoaded = function(cb) {
-  if (typeof document !== 'undefined' && document !== null) {
+  if (typeof document !== 'undefined' && document !== null && !/comp|inter|loaded/.test(document.readyState)) {
       document.addEventListener('DOMContentLoaded', cb);
   } else {
     cb();