Add a port to Postgres config

Sometimes the port isn't just 5432... 
So I added it as an option to the postgres class.
However, I wasn't really able to run the tests, so I hope it's good. And added a makefile to streamtime the process but it's not really working for me yet (there are import errors when running the tests and I can't figure out why). The errors were before my change (I mean my errors...)

Anyway, I hope both additions are welcome the makefile and the optional port. 

thank you!