Add script for installing deps

Author: OliverJAsh

README.md

@@ -176,6 +176,8 @@ bundle
 ./node_modules/.bin/jspm install
 ```
 
+npm, bundle, and jspm are also run by `install-dependencies.sh`.
+
 After this, you can compile the assets:
 ```
 grunt prepare compile

install-dependencies.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+npm install
+bundle
+./node_modules/.bin/jspm install