chore(build): Build/linting infrastructure updates. (#276)

* Move npm/linting config files to root directory
* Apply prettier/eslint autofixes
* Update CONTRIBUTING.md

.eslintrc.json

@@ -0,0 +1,10 @@
+{
+  "env": {
+    "es6": true,
+    "node": true
+  },
+  "extends": "eslint:recommended",
+  "rules": {
+    "no-console": ["off"]
+  }
+}