Remove some debug/console.log statements.

Fix allFieldGuideIds method in resources.js to return an array of _ids, not an array of objects.
Field guide controller now correctly completes field guides. Closes #367.

controllers/resources.js

@@ -261,9 +261,7 @@ module.exports = {
     } else {
       allFieldGuideIds = fieldGuides.
         map(function (elem) {
-          return {
-            _id: elem._id
-          };
+          return elem._id;
         });
       return allFieldGuideIds;
     }