fix: upgrade aegir and ensure glob is mocked

Fixes #354,#353

Author: dignifiedquire

.aegir.js

@@ -14,8 +14,8 @@ module.exports = {
       }
     },
     externals: {
-      fs: '{}',
       mkdirp: '{}',
+      glob: '{}',
       'simple-websocket-server': '{}'
     }
   }

package.json

@@ -40,7 +40,7 @@
   },
   "homepage": "https://github.com./ipfs/js-ipfs#readme",
   "devDependencies": {
-    "aegir": "^3.2.0",
+    "aegir": "^4.0.0",
     "buffer-loader": "0.0.1",
     "chai": "^3.5.0",
     "expose-loader": "^0.7.1",
@@ -118,4 +118,4 @@
     "kumavis <[email protected]>",
     "nginnever <[email protected]>"
   ]
-}
+}