added more files

docker/py+npm.dockerfile

@@ -1,13 +1,11 @@
 # dobromirpopov/pynode
 FROM python:slim
 
-# System dependencies and Node.js/npm installation
-RUN apt-get update \
-    && apt-get install -y git curl nodejs npm \
-    && apt-get clean \
-    && rm -rf /var/lib/apt/lists/*
+## System dependencies and Node.js/npm installation
+RUN apt-get update && apt-get install -y \
+    git curl nodejs npm gnupg2 wget build-essential
 
-# Upgrade pip
+## Upgrade pip
 RUN pip install --upgrade pip
 
 # Verify installations