First batch of cros-disk changes

First batch of cros-disk changes

A couple of things in this CL. 

1. Adds an upstart script that runs the daemon as cros-disks.
2. Adds some functions to the d-bus API.
3. Adds support for watching udev for changes.
4. Adds a DiskManager class for processing disk changes.
5. Adds a Disk class to store the properties that we care about.
6. Some Makefile changes to fix NDEBUG and gflags issues.

Change-Id: I92f7d9199b71aa0150ad82cabe36c5396a4603c8

BUG=13698
TEST=Ran the autotest and manually tested that I was getting udev changes on a cr-48.

Committed: http://chrome-svn/viewvc/chromeos?view=rev&revision=c523a85

[Chris Masone, 2011-04-11 02:50:45]

LGTM w/nits, also remove jjjjjjjjjj in main.cc

http://codereview.chromium.org/6824032/diff/1/disk.h
File disk.h (right):

http://codereview.chromium.org/6824032/diff/1/disk.h#newcode30
disk.h:30: void is_drive(bool is_drive) { is_drive_ = is_drive; }
Setters should start with set_

http://codereview.chromium.org/6824032/diff/1/disk.h#newcode54
disk.h:54: std::string mount_path() const { return mount_path_; }
const std::string&