Use zmodem.js from npm rather than a git submodule.

package-lock.json

@@ -672,6 +672,16 @@
       "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=",
       "dev": true
     },
+    "crc-32": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/crc-32/-/crc-32-1.1.1.tgz",
+      "integrity": "sha1-XXOdXkxuNSrYME1zIj1IP+Va240=",
+      "dev": true,
+      "requires": {
+        "exit-on-epipe": "1.0.1",
+        "printj": "1.1.0"
+      }
+    },
     "create-ecdh": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/create-ecdh/-/create-ecdh-4.0.0.tgz",
@@ -1031,6 +1041,12 @@
         }
       }
     },
+    "exit-on-epipe": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/exit-on-epipe/-/exit-on-epipe-1.0.1.tgz",
+      "integrity": "sha512-h2z5mrROTxce56S+pnvAV890uu7ls7f1kEvVGJbw1OlFH3/mlJ5bkXu0KRyW94v37zzHPiUd55iLn3DA7TjWpw==",
+      "dev": true
+    },
     "express": {
       "version": "4.13.4",
       "resolved": "https://registry.npmjs.org/express/-/express-4.13.4.tgz",
@@ -1502,11 +1518,6 @@
         "mime-types": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.14.tgz"
       }
     },
-    "formdata-polyfill": {
-      "version": "2.0.4",
-      "resolved": "https://registry.npmjs.org/formdata-polyfill/-/formdata-polyfill-2.0.4.tgz",
-      "integrity": "sha512-jsOLsQy0/dbO7BG3G9H1riXNuVxn5L2aBqdyzYUnxk1Jt4KztpF5N2HgHijzfs52temBpLYXz/jEwkbcQodfdQ=="
-    },
     "fs-extra": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-1.0.0.tgz",
@@ -11795,6 +11806,12 @@
       "integrity": "sha1-IZMqVJ9eUv/ZqCf1cOBL5iqX2lQ=",
       "dev": true
     },
+    "printj": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/printj/-/printj-1.1.0.tgz",
+      "integrity": "sha512-NbiNBOQ0GioHyeD3ni8wZB7ZmfU7mxIrqhWR5XSreX3rUVvk5UOwpzxOnWqrLdCtoBbdQ40sEwC+nXxxjlUo0A==",
+      "dev": true
+    },
     "process": {
       "version": "0.11.10",
       "resolved": "https://registry.npmjs.org/process/-/process-0.11.10.tgz",
@@ -12436,7 +12453,8 @@
     "text-encoding": {
       "version": "0.6.4",
       "resolved": "https://registry.npmjs.org/text-encoding/-/text-encoding-0.6.4.tgz",
-      "integrity": "sha1-45mpgiV6J22uQou5KEXLcb3CbRk="
+      "integrity": "sha1-45mpgiV6J22uQou5KEXLcb3CbRk=",
+      "dev": true
     },
     "through": {
       "version": "2.3.8",
@@ -13448,6 +13466,15 @@
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
       "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
       "dev": true
+    },
+    "zmodem.js": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/zmodem.js/-/zmodem.js-0.1.1.tgz",
+      "integrity": "sha1-KmQTeFGRndgRIG+UirTpAf9/lww=",
+      "dev": true,
+      "requires": {
+        "crc-32": "1.1.1"
+      }
     }
   }
 }