Rename pull() to fetch().  It does a git fetch and then a
git fetch --tags.
Add _run() method to handle all subprocess.Popen calls.  Change
all previous calls to subprocess.Popen to use _run().

Fix for an exception when for whatever reason the inventory script fails

Adding more instance groups

Fixed the way dom0/domU xen role is defined in the setup module

Fix first_available_file and add test-case

Fix to user module to use self when calling group_exists

This avoids a traceback that gave no clue as to what was happening.

Improve the mail callback to support differing failures

Keep fireball from spreading its socket around

Since callbacks are called with different argument-types, we have to be careful. We support two different distinct cases:

 - The error information can be in one ore more of the following items (msg, stderr or stdout)
 - The res/msg value returned can be a string or a list

Fixes to the user module

Also fix missing -G on groups change

Lost section from commit 8049777

Conflicts:
	examples/ansible.cfg

+ doc tweak

Make things more reusable, correct some errors along the SSH key path

Conflicts:
	library/user

if a module returns failed in the results, don't fail unless failed is n...

Signed-off-by: Brian Coca <briancoca+ansible@gmail.com>