Update to Gatsby v2

You now can use the source plugin with Gatsby v2. You need to update to use v3.0.0 as the peerDependency is aimed at that.

Also updated some packages and added ESLint/Prettier

.babelrc

@@ -1,13 +1,6 @@
 {
-  "plugins": ["transform-object-rest-spread"],
   "presets": [
-    [
-      "env",
-      {
-        "targets": {
-          "node": 6
-        }
-      }
-    ]
+    "env",
+    "stage-0"
   ]
-}
+}

.eslintrc

@@ -0,0 +1,81 @@
+{
+  "extends": [
+    "airbnb",
+    "prettier",
+    "prettier/react"
+  ],
+  "parser": "babel-eslint",
+  "parserOptions": {
+    "ecmaVersion": 2017,
+    "ecmaFeatures": {
+      "experimentalObjectRestSpread": true,
+      "impliedStrict": true,
+      "classes": true
+    }
+  },
+  "env": {
+    "browser": true,
+    "node": true,
+    "jquery": true
+  },
+  "rules": {
+    "no-unused-vars": [
+      1,
+      {
+        "argsIgnorePattern": "res|next|^err"
+      }
+    ],
+    "arrow-body-style": [
+      2,
+      "as-needed"
+    ],
+    "no-param-reassign": [
+      2,
+      {
+        "props": false
+      }
+    ],
+    "no-console": 0,
+    "linebreak-style": 0,
+    "no-use-before-define": 0,
+    "import/prefer-default-export": 0,
+    "import": 0,
+    "func-names": 0,
+    "space-before-function-paren": 0,
+    "import/extensions": 0,
+    "no-underscore-dangle": 0,
+    "consistent-return": 0,
+    "react/display-name": 1,
+    "react/react-in-jsx-scope": 0,
+    "react/forbid-prop-types": 0,
+    "react/no-unescaped-entities": 0,
+    "react/jsx-filename-extension": [
+      1,
+      {
+        "extensions": [
+          ".js",
+          ".jsx"
+        ]
+      }
+    ],
+    "quotes": [
+      2,
+      "single",
+      {
+        "avoidEscape": true,
+        "allowTemplateLiterals": true
+      }
+    ],
+    "prettier/prettier": [
+      "error",
+      {
+        "trailingComma": "es5",
+        "singleQuote": true,
+        "printWidth": 120
+      }
+    ]
+  },
+  "plugins": [
+    "prettier"
+  ]
+}

.gitignore

@@ -57,3 +57,6 @@ typings/
 # dotenv environment variables file
 .env
 
+.idea
+gatsby-node.js
+!/src/gatsby-node.js

.npmignore

@@ -0,0 +1,35 @@
+# Logs
+logs
+*.log
+
+# Runtime data
+pids
+*.pid
+*.seed
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directory
+# https://www.npmjs.org/doc/misc/npm-faq.html#should-i-check-my-node_modules-folder-into-git
+node_modules
+*.un~
+yarn.lock
+package.lock
+src
+flow-typed
+decls
+.eslintrc
+.idea