Docker related updates

- Updated Dockerfile for node app build
 - Added docker-compose.yml for including mongodb
 - Bundled dev db data into 'conduit' folder

Dockerfile

@@ -1,5 +1,5 @@
 # Base image
-FROM mhart/alpine-node:8.5.0
+FROM node:8.5.0
 
 ## Create app directory
 RUN mkdir -p /usr/src/app

conduit

@@ -0,0 +1 @@
+/usr/local/var/mongodb/conduit/

docker-compose.yml

@@ -1,4 +1,4 @@
-version: "2"
+version: "3"
 services:
   app:
     container_name: app
@@ -12,6 +12,6 @@ services:
     container_name: mongo
     image: mongo
     volumes:
-      - ./data:/data/db
+      - ./conduit:/data/db/
     ports:
       - "27017:27017"