Added alembic configuration, created a migration script to add 2 columns
"usernames" and "packages" and modified the add function to default
usernames and packages using fedmsg.meta.

This fixes #4 and #5
Alembic safety net, stamps recent revision as head
back to sqlite for development
just to show off the pretty code we arent going to use
Messages added to one class
Many to Many username:Msg and Package:Msg
Changed models in tests to Message
Merge pull request #17 from HousewifeHacker/alembic

Added alembic configuration, created a migration script