Introduce sequelize migrations to create and migrate database tables and removed database scripts. See http://sequelizejs.com/docs/latest/migrations

Created seeds to initialize database with dummy tasks.
Introduce config module to handle configurations per environment. See https://github.com/lorenwest/node-config
Updated README.md to reflect changes.

config/development.json

@@ -0,0 +1,9 @@
+{
+  "port": 3000,
+  "database": {
+      "options"   : {
+          "dialect": "sqlite",
+          "storage": "db/development.sqlite"
+      }
+  }
+}