[Mod] setup.py: use psycopg2-binary instead of psycopg2, and only install when psycopg2 doesn't exists.
[Mod] setup.py: use psycopg2-binary instead of psycopg2, and only install when psycopg2 doesn't exists.

andrewchenshx/vnpy,vnpy/vnpy,bigdig/vnpy,andrewchenshx/vnpy,bigdig/vnpy,bigdig/vnpy,andrewchenshx/vnpy,andrewchenshx/vnpy,msincenselee/vnpy,msincenselee/vnpy,msincenselee/vnpy,andrewchenshx/vnpy,bigdig/vnpy,msincenselee/vnpy,vnpy/vnpy