Remove dependencies that are no longer used.

package.json

@@ -83,7 +83,6 @@
     "imports-loader": "^0.7.1",
     "jest": "^20.0.4",
     "jest-cli": "^20.0.4",
-    "json-loader": "^0.5.4",
     "lint-staged": "^3.3.1",
     "node-sass": "^3.10.0",
     "npm-check": "^5.2.3",
@@ -108,12 +107,10 @@
   "dependencies": {
     "classnames": "^2.2.5",
     "create-react-class": "^15.6.0",
-    "dateformat": "^1.0.12",
     "fuzzy": "^0.1.1",
     "gotrue-js": "^0.9.3",
     "gray-matter": "^3.0.6",
     "history": "^2.1.2",
-    "immutability-helper": "^2.0.0",
     "immutable": "^3.7.6",
     "js-base64": "^2.1.9",
     "js-yaml": "^3.10.0",
@@ -125,7 +122,6 @@
     "mdast-util-to-string": "^1.0.4",
     "moment": "^2.11.2",
     "normalize.css": "^4.2.0",
-    "prismjs": "^1.5.1",
     "prop-types": "^15.5.10",
     "react": "^15.1.0",
     "react-autosuggest": "^7.0.1",
@@ -134,9 +130,6 @@
     "react-frame-component": "^1.0.3",
     "react-hot-loader": "^3.0.0-beta.7",
     "react-immutable-proptypes": "^2.1.0",
-    "react-lazy-load": "^3.0.3",
-    "react-portal": "^2.2.1",
-    "react-pure-render": "^1.0.2",
     "react-redux": "^4.4.0",
     "react-router": "^2.5.1",
     "react-router-redux": "^4.0.5",
@@ -144,7 +137,6 @@
     "react-simple-dnd": "^0.1.2",
     "react-sortable": "^1.2.0",
     "react-split-pane": "^0.1.57",
-    "react-textarea-autosize": "^4.3.2",
     "react-toolbox": "^1.2.1",
     "react-topbar-progress-indicator": "^1.0.0",
     "react-transition-group": "1.x",