update to slick 2.0.2 and mysql connector 5.1.31
- activate travis ci build by adding .travis.yml file

For the slick test of postgres and mysql there running server needed.
The travis build will install a postgres database and i guess a mysql is already
available.

The pre installed version of mysql and postgres on travis are configured with blank passwords.
The user for mysql is root (full rights) and for postgres is postgres.# and have 1 and 5 different commits each, respectively.