Add support for additional dependencies through /app/package.json

Author: erikap

Dockerfile

@@ -14,4 +14,4 @@ RUN npm install
 CMD sh boot.sh
 
 ONBUILD ADD . /app/
-ONBUILD RUN cd /usr/src/app && npm install
+ONBUILD RUN cd /usr/src/app && npm install && npm install /app

boot.sh

@@ -1,5 +1,7 @@
 #! /bin/sh
+
 ## Install new dependencies
+npm install /app
 npm install
 
 ./node_modules/supervisor/lib/cli-wrapper.js \