twitter credentials abstracted to config.json
	new file:   app.js
	renamed:    test/test.js -> test/connection-tests.js
mongoose test that adds a test entry to the tweet database
	modified:   .gitignore
	modified:   app.js
	deleted:    connection-test.js
	modified:   package.json
	modified:   test/connection-tests.js
added db integration tests
	new file:   test/db-tests.js
tweet stream writes to static file as precursor to db write