Add eslint config

An early start that gets some linting in place.

.eslintignore

@@ -0,0 +1 @@
+src/vector/modernizr.js

.eslintrc.js

@@ -0,0 +1,3 @@
+module.exports = {
+    extends: ["./node_modules/matrix-react-sdk/.eslintrc.js"],
+}

package.json

@@ -41,6 +41,8 @@
     "start:js:prod": "NODE_ENV=production webpack-dev-server -w --progress",
     "start": "node scripts/babelcheck.js && parallelshell \"npm run start:res\" \"npm run start:js\"",
     "start:prod": "parallelshell \"npm run start:res\" \"npm run start:js:prod\"",
+    "lint": "eslint src/",
+    "lintall": "eslint src/ test/",
     "clean": "rimraf lib webapp electron/dist",
     "prepublish": "npm run build:compile",
     "test": "karma start --single-run=true --autoWatch=false --browsers PhantomJS --colors=false",
@@ -95,6 +97,9 @@
     "electron-builder": "^11.2.4",
     "electron-builder-squirrel-windows": "^11.2.1",
     "emojione": "^2.2.3",
+    "eslint": "^3.14.0",
+    "eslint-plugin-flowtype": "^2.30.0",
+    "eslint-plugin-react": "^6.9.0",
     "expect": "^1.16.0",
     "fs-extra": "^0.30.0",
     "html-webpack-plugin": "^2.24.0",

test/.eslintrc.js

@@ -0,0 +1,5 @@
+module.exports = {
+    env: {
+        mocha: true,
+    },
+}