Change psycopg2 to psycopg2-binary in setup requirements

[kunalbhagawati]

Change the psycopg driver dependency to the one that includes the internal dependencies. This makes it easier to have postgres as a docker container while still running the main app in the host OS.

[coveralls]

Coverage remained the same at 97.061% when pulling 676b777 on kunalbhagawati:feature/change_pscopg_requirement into cbfb0c1 on seantis:master.