Merge pull request #81 from kamelzcs/master

Fixed Psycopg2 link error.
Using aliasing in ping command. Fixes #74.

Signed-off-by: Zaar Hai <haizaar@haizaar.com>
Merge pull request #83 from haizaar/master

Using aliasing in ping command. Fixes #74.
Added note for putconn function.