update dockerfile to eliminate problematic meteor build

Dockerfile

-FROM meteorhacks/meteord:onbuild
+FROM node:0.10
+
+MAINTAINER buildmaster@rocket.chat 
+
+RUN groupadd -r rocketchat \
+&&  useradd -r -g rocketchat rocketchat
+
+# gpg: key 4FD08014: public key "Rocket.Chat Buildmaster <buildmaster@rocket.chat>" imported
+RUN gpg --keyserver ha.pool.sks-keyservers.net --recv-keys 0E163286C20D07B9787EBE9FD7F9D0414FD08104
+
+
+RUN curl -fSL "http://http://rocketchatbuild.s3-website-us-east-1.amazonaws.com/rocket.chat-v.latest.tgz" -o rocket.chat.tgz \
+&&  tar zxvf ./rocket.chat.tgz \
+&&  rm ./rocket.chat.tgz \
+&&  cd /app/bundle/programs/server \
+&&  npm install
+
+WORKDIR /app/bundle
+USER rocketchat
+
+# needs a mongoinstance - defaults to container linking with alias 'db' 
+ENV MONGO_URL=mongodb://db:27017/meteor \
+    PORT=3000 \
+    ROOT_URL=http://localhost:3000
+
+EXPOSE 3000
+CMD ["node", "main.js"]
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