add prettier and tslint packages

.prettierrc.json

@@ -0,0 +1,3 @@
+{
+  "singleQuote": true
+}

package.json

@@ -7,6 +7,7 @@
   "scripts": {
     "combine-coverage": "istanbul-combine packages/*/coverage/coverage*.json",
     "coveralls": "cat ./coverage/lcov.info | coveralls -v",
+    "lint": "tslint ./packages/**/*.[j,t]s",
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "repository": {
@@ -37,9 +38,13 @@
     "istanbul-combine": "0.3.0",
     "mocha": "5.2.0",
     "nyc": "13.0.1",
+    "prettier": "^1.15.3",
     "source-map-support": "0.5.9",
     "supertest": "3.3.0",
     "ts-node": "7.0.1",
+    "tslint": "^5.12.0",
+    "tslint-config-prettier": "^1.17.0",
+    "tslint-plugin-prettier": "^2.0.1",
     "typescript": "2.9.2"
   }
 }

tslint.json

@@ -0,0 +1,21 @@
+{
+    "defaultSeverity": "error",
+    "extends": [
+        "tslint:recommended",
+        "tslint-config-prettier",
+        "tslint-plugin-prettier"
+    ],
+    "jsRules": {
+        "no-console": false,
+        "object-literal-sort-keys": false,
+        "prettier": true
+    },
+    "rules": {
+        "interface-name": false,
+        "no-console": false,
+        "no-var-requires": false,
+        "object-literal-sort-keys": false,
+        "prettier": true
+    },
+    "rulesDirectory": []
+}