Add yet-another-react-lightbox package and update .gitignore to exclude node_modules

frontend/node_modules/is-arrayish/package.json

@@ -1,34 +0,0 @@
-{
-  "name": "is-arrayish",
-  "description": "Determines if an object can be used as an array",
-  "version": "0.2.1",
-  "author": "Qix (http://github.com/qix-)",
-  "keywords": [
-    "is",
-    "array",
-    "duck",
-    "type",
-    "arrayish",
-    "similar",
-    "proto",
-    "prototype",
-    "type"
-  ],
-  "license": "MIT",
-  "scripts": {
-    "pretest": "xo",
-    "test": "mocha --compilers coffee:coffee-script/register"
-  },
-  "repository": {
-    "type": "git",
-    "url": "https://github.com/qix-/node-is-arrayish.git"
-  },
-  "devDependencies": {
-    "coffee-script": "^1.9.3",
-    "coveralls": "^2.11.2",
-    "istanbul": "^0.3.17",
-    "mocha": "^2.2.5",
-    "should": "^7.0.1",
-    "xo": "^0.6.1"
-  }
-}