Add the client host IP address and port to application_name.

This is enabled by a config parameter which defaults to 'on'

If the client subsequently overwrites the application_name parameter
during the session then this won't be sticky, but it does let you see
(and log) where queries are actually coming from instead of just seeing
pgbouncer as the source address and port.
Updated readme with "look below for git compile instructions", as well as missing dependancy.
Merge pull request #23 from pgexperts/appname-hostport

Add the client host IP address and port to application_name.
Upgrade libusual
Make application_name_add_host work also with unix sockets.
Merge pull request #24 from pgexperts/master

Updated readme with "look below for git compile instructions", as well a...
max_user_connections implementation - a limit of connected users.

It is similar to max_db_connections. It is designed for a usage, where databases on server are "unlimited"