refactor-[Test DB]: switch test database to postgres (#40)

- Change test DB to a PostgreSQL database to accomodate for new use cases
- Provision PostgreSQL service for TravisCI

.env.sample

@@ -1,6 +1,6 @@
 PORT=8080
 DB_URL_DEV=postgres://rambo:rambo@localhost:2800/haven
-DB_URL_PRODUCTION=postgres://authors:haven@localhost:2800/haven
+DATABASE_URL=postgres://authors:haven@localhost:2800/haven
 NODE_ENV=development
 BASE_URL=/api/v5
 JWT_KEY=passkey
@@ -18,3 +18,5 @@ SENDGRID_API_KEY=gjkijsjdkhfjkshfhfsjh
 CLOUD_NAME=teamrambo
 CLOUD_API_KEY=rambo
 CLOUD_API_SECRET=rambo
+DB_URL_TEST=postgres://rambo:rambo@localhost:2800/haven
+SERVER_URL=http://localhost:9000

.travis.yml

@@ -11,6 +11,12 @@ cache:
   directories:
     - node_modules
 
+services:
+  - postgresql
+
+before_script:
+  - psql -c 'create database ah_rambo_test;' -U postgres
+
 script: 
   - npm test
 

server/database/config/config.js

@@ -9,8 +9,8 @@ const development = {
 };
 
 const test = {
-  storage: ':memory',
-  dialect: 'sqlite'
+  use_env_variable: 'DB_URL_TEST',
+  dialect: 'postgres'
 };
 
 const production = {