Import github.com/golang/glog into third_party.

Revision imported:

    commit 20cea4dfef0c0151bba0422a6244cc1d3e8292b1
    Author: David Symonds <dsymonds@golang.org>
    Date:   Wed Oct 9 08:22:02 2013 +1100

        Create a relative symlink for log files.

        This matches what C++ does in practice, and permits this code to work
        if -log_dir is a relative path.

Change-Id: Ifb81ae766ed5ab58fd45d3c7f485a065b01ec162
sync: wake up early from sleep if a blob arrives

Change-Id: I49240d1970e537e3ace36f4cd02315ff3ed9d6b2
Merge branch 'master' of https://camlistore.googlesource.com/camlistore