Change CSS dependencies to not hardcoded paths

Add add direct dependencies on the packages they come from, because
referring to them by path like this doesn't work in a frash
checkout / npm install because of how npm lays out the packages.

package.json

@@ -58,8 +58,12 @@
     "babel-runtime": "^6.11.6",
     "bluebird": "^3.5.0",
     "browser-request": "^0.3.3",
+    "draft-js": "^0.10.5",
     "extract-text-webpack-plugin": "^0.9.1",
     "favico.js": "^0.3.10",
+    "gemini-scrollbar": "^1.5.3",
+    "gfm.css": "^1.1.2",
+    "highlight.js": "^9.12.0",
     "matrix-js-sdk": "0.10.2-rc.1",
     "matrix-react-sdk": "0.12.3-rc.2",
     "modernizr": "^3.1.0",