Setup AWS RDS for SQL Database

[bbugyi200]

I think the SQL database used by SlackRU (sqlite3 currently) needs a major remodel. I am concerned with needing to access the database during production for a hotfix. Currently, I don't see how I could do such a thing. The plan is to switch SlackRU over to using Flask's SQLAlchemy and then to use this framework to connect to an AWS RDS MySQL database. This way we will have access to directly modify this database in production if necessary.