add backup= option to copy. makes a backup of the file on the target

Feature/sudo cmd not defined

We need to include the license when we ship RPMs

Include bin/ansible-pull as part of the sdist in distutils.

The `val if something else something-else` syntax does not work prior to 2.5

in a file named: $filename.YYYY-MM-DD@HH:MM~

backup=False is default

make yum module work with list=pkgspec

Update man pages and the message for an exception.

Added commit time information to the --version output

Now prints date of commit (and timezone offset of commit)
Hopefully resolves #783

Only run yum,apt through the with_items loop if there is a list of items.  Just a cosmetic fix on return values
for the most part.

Running ansible --version now outputs git information when the
repo lives in .git in the root of the ansible source (coping with the case
where the git info is elsewhere is left as an exercise).

This uses gitpython where installed, otherwise it interrogates the files
in the .git directory to get the same information.

The gitpython path could be removed, but then people might ask 'why did
you do it like this when gitpython exists'

add apt_repository module

add pip module

Add supervisorctl module

Add easy_install module

fix up yum state=latest with pkg groups

Make exception more specific (OSError) in setup module for selinux call

want to install an old package happy.