Remove meteor-promise and fibers, which appear to be unused entir…

…ely.

While originally introduced in
#92 to accommodate
Meteor, it seems that we're no longer making `Promise`s Fiber-aware using
the `meteor-promise` library which leverages `fibers` under-the-hood.

Since this package seems to be the sole reason that bootstrapping is failing
on Node.js 12.  To support Node.js 12, we could update to `fibers@4` which
accommodates changes to the V8 API which have been made in recent Node.js
versions, the `fibers@4` implementation is only compatible with Node.js 10
and 12 and is incompatible with Node.js 8, which we still actively support
(though not for much longer!).

package.json

@@ -74,7 +74,6 @@
     "@types/body-parser": "1.17.0",
     "@types/connect": "3.4.32",
     "@types/fast-json-stable-stringify": "2.0.0",
-    "@types/fibers": "0.0.30",
     "@types/graphql": "14.2.2",
     "@types/hapi": "17.8.6",
     "@types/ioredis": "4.0.12",
@@ -106,7 +105,6 @@
     "deep-freeze": "0.0.1",
     "express": "4.17.1",
     "fastify": "1.14.6",
-    "fibers": "3.1.1",
     "form-data": "2.4.0",
     "graphql": "14.4.1",
     "graphql-subscriptions": "1.1.0",
@@ -125,7 +123,6 @@
     "lerna": "3.13.4",
     "lint-staged": "8.2.1",
     "memcached-mock": "0.1.0",
-    "meteor-promise": "0.8.7",
     "mock-req": "0.2.0",
     "multer": "1.4.1",
     "node-fetch": "2.3.0",