Some dep updates

* Sub dep *mongodb-core* updated in all related MongoDB deps Ref: https://github.com/christkv/mongodb-core/issues/66#issuecomment-167133267
* Delete ops retested

**NOTE**:
* We haven't gotten these except for [that one one initial time](Automattic/mongoose#3588 (comment)) but I've also restarted the server a few times after the initial ~3 day test period and could still be lurking.

package.json

@@ -6,14 +6,14 @@
   "dependencies": {
     "ace-builds": "git://github.com/ajaxorg/ace-builds#3fb55e8",
     "async": "1.5.0",
-    "aws-sdk": "2.2.24",
+    "aws-sdk": "2.2.26",
     "body-parser": "1.14.2",
     "bootstrap": "3.3.6",
     "bootstrap-markdown": "2.9.0",
     "chalk": "1.1.1",
     "clipboard": "1.5.5",
     "compression": "1.6.0",
-    "connect-mongo": "1.0.2",
+    "connect-mongo": "1.1.0",
     "cookie-parser": "1.4.0",
     "express": "4.13.3",
     "express-minify": "0.1.6",
@@ -29,7 +29,7 @@
     "marked": "0.3.5",
     "method-override": "2.3.5",
     "moment": "2.10.6",
-    "mongoose": "4.3.3",
+    "mongoose": "4.3.4",
     "morgan": "1.6.1",
     "mu2": "0.5.20",
     "octicons": "3.3.0",