dockerfile speed optimizations

closes #36

Dockerfile

@@ -11,10 +11,11 @@ RUN mkdir -p /quickstart /home/nodejs && \
     chown -R nodejs:nodejs /home/nodejs
 
 WORKDIR /quickstart
-COPY . /quickstart/
-RUN chown -R nodejs:nodejs /quickstart
+COPY package.json typings.json /quickstart/
+RUN npm install --unsafe-perm=true
 
+COPY . /quickstart
+RUN chown -R nodejs:nodejs /quickstart
 USER nodejs
-RUN npm install
 
 CMD npm start

package.json

@@ -8,7 +8,7 @@
     "lite": "lite-server",
     "typings": "typings",
     "docker-build": "docker build -t ng2-quickstart .",
-    "docker-run": "docker run -it --rm -p 3000:3000 -p 3001:3001 ng2-quickstart",
+    "docker": "npm run docker-build && docker run -it --rm -p 3000:3000 -p 3001:3001 ng2-quickstart",
     "postinstall": "typings install"
   },
   "license": "ISC",