Adds Sequelize

Add the sequelize and pg packages and run the `sequelize init` to prime
the configuration.
Add basic sequelize config for postgres
Adds models for slides and slide deck
Integrate sequelize into express app
Add a README
Configure postgres-friendly table names
Add an outline for a test for GET /decks

Added `chai` assertions library.
Use grunt-env to configure different ports for test and dev
Configure grunt with watch plugin and jshint
Fix initial jshint issues
Configure grunt watch to run tests
Read real data from the decks table
Merge pull request #1 from stevehook/data

Add initial persistence layer with sequelize