Resolve "Timeout value defaults should be `0`"

Closes #14 (closed)

Timeout value default should be 0, or should be mandatory. I opt for 0 (meaning no timeout), because that is the default timeout value of psycopg2 anyway.

\approve @ds @tara @gislars

databaselib/database.py

@@ -185,7 +185,7 @@ class PostGISDatabase(AbstractDatabase):
         password (str):
             Password for the database connection.
         timeout (int, optional, default: 0):
-            Timeout for SQL queries in milliseconds.
+            Timeout for SQL queries in milliseconds (`0` equals to no timeout).
         itersize (int, optional, default: 10000):
             Number of rows fetched from the server at one call.