Revert "Added suffix parameter"

This reverts commit 3c4ec687273416b355c20282e33249d87cd84b52.

Given graphite's support for wildcards anywhere in the chain, this is an
unnecessary complication. The same thing can be achieved with the
prefix, e.g.:

    >>> import socket;
    >>> host, _, _ = socket.gethostname().partition('.')
    >>> prefix = 'my_app.' + host
    >>> client = StatsClient(prefix=prefix)

Stats can be accessed in aggregate as 'stats.my_app.*.whatever.stat'.