Requirements diverge: setup.py + requirements.txt

[nesnoj]

The reqs in setup.py and requirements.txt are not equal: psycopg2 was not changed to psycopg2-binary in the latter (#19) and some packages are missing. Does it make sense do bring them in line?

requirements.txt seems only to be used by travis, I propose to kick the reqs out of setup and only use the requirements.txt.