Progress callback function and chunk size support

A progress callback function can be provided to the SwiftService
upload and download methods. Function will be called with
(transfered_size, total_size) arguments at given chunk size read.
Parameters are named chunk_size and progress_cb.

python-swiftclient 2.2.0 release

This release includes the following significant improvements:

* Ability to specify a storage policy when creating containers

* Ability to generate Swift tempurls from the CLI and SDK

* Added context-sensitive help messages to commands

2.1.0 release of python-swiftclient

This release includes:

Support for python3.3

There are a couple of other minor fixes and improvements too.

2.0.3 release

Fixes issue with doing segmented uploads

2.0.2 release

2.0.1 release

This fixes an issue with --insecure in the CLI discovered
shortly after the 2.0 release.

2.0 release

This change in the major version number is based on the
underlying port to use the python requests library rather
than httplib.

1.9.0 release

This is the last release of the 1.X series.

1.8.0 release to make pbr a build-time dependency

Releasing 1.7.0

This release is promted by a dependency change that should avoid
painful dependency management issues. The main issue was the
requirement for d2to1. By removing it we resolve some issues related
to upstream changes in distribute and pip, especially on older systems
(see http://lists.openstack.org/pipermail/openstack-dev/2013-July/011425.html).