Add cleanup script to fix any problems arising from restarting the server mid-stream.

This may cause further problems if the user manages to reconnect before the cleanup script has finished, but the server *shouldn't* start listening until after the script is done.
Increment version I guess, I don't really know how versioning works.

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "satyr",
-  "version": "0.2.0",
+  "version": "0.3.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -2370,6 +2370,14 @@
         "readable-stream": "^2.0.2"
       }
     },
+    "recursive-readdir": {
+      "version": "2.2.2",
+      "resolved": "https://registry.npmjs.org/recursive-readdir/-/recursive-readdir-2.2.2.tgz",
+      "integrity": "sha512-nRCcW9Sj7NuZwa2XvH9co8NPeXUBhZP7CRKJtU+cS6PW9FpCIFoI5ib0NT1ZrbNuPoRy0ylyCaUL8Gih4LSyFg==",
+      "requires": {
+        "minimatch": "3.0.4"
+      }
+    },
     "regex-not": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/regex-not/-/regex-not-1.0.2.tgz",