Bump express and socket.io to their latest patch versions

Greenkeeper missed express because of their odd RC releases, and we are still stuck trying to bump socket.io to their v2

package.json

@@ -45,7 +45,7 @@
     "colors": "1.1.2",
     "commander": "2.11.0",
     "event-stream": "3.3.4",
-    "express": "4.15.2",
+    "express": "4.15.3",
     "express-handlebars": "3.0.0",
     "fs-extra": "3.0.1",
     "irc-framework": "2.8.1",
@@ -55,7 +55,7 @@
     "read": "1.0.7",
     "request": "2.81.0",
     "semver": "5.3.0",
-    "socket.io": "1.7.3",
+    "socket.io": "1.7.4",
     "spdy": "3.4.7"
   },
   "devDependencies": {
@@ -75,7 +75,7 @@
     "mousetrap": "1.6.1",
     "npm-run-all": "4.0.2",
     "nyc": "11.0.3",
-    "socket.io-client": "1.7.3",
+    "socket.io-client": "1.7.4",
     "stylelint": "7.12.0",
     "stylelint-config-standard": "16.0.0",
     "urijs": "1.18.10",