database setup

[joshuavial]

• [x] get knex going in dev
• [x] get knex going in test
• [x] setup a simple accounts table with migration
• [x] load databases in server.js from knexfile.js

[joshuavial]

Look at the process.env.NODE_ENV variable (development, test, production) use that to determine which config to read from knexfile.js

knex_config = require('knexfile')

db_config = knex_cofnig[proces.env.NODE_ENV]
knex = require('knex')(db_config)