Adding pg-hstore dependency

package.json

@@ -18,7 +18,10 @@
     },
     {
       "name": "Jan Aagaard Meier",
-      "email": ["janzeh@gmail.com", "jmei@itu.dk"]
+      "email": [
+        "janzeh@gmail.com",
+        "jmei@itu.dk"
+      ]
     }
   ],
   "repository": {
@@ -38,7 +41,8 @@
     "dottie": "0.0.6-1",
     "toposort-class": "0.1.4",
     "generic-pool": "2.0.3",
-    "promise": "~3.0.0"
+    "promise": "~3.0.0",
+    "pg-hstore": "~1.0.3"
   },
   "devDependencies": {
     "jasmine-node": "1.5.0",