Add typescript dependency for bokehjs

Author: bnaul

package.json

@@ -23,6 +23,7 @@
     "redux-logger": "^2.8.1",
     "redux-thunk": "^2.2.0",
     "style-loader": "^0.13.2",
+    "typescript": "^2.2.2",
     "webpack": "^2.2.1",
     "webpack-dev-server": "^2.4.1",
     "whatwg-fetch": "^2.0.2"