Fix python3 unicode support for git

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>
Fix tests for python3.3
Bump copyright

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>
Document that git can use shell integration

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>
Add bzr shell integration

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>
Drop support for python2.4 and python2.5

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>
Update changelog

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>