Squashed commit of the following:

commit 48069adf0f47b09f675a9ba59360ca216b695ceb
Author: Gregory Duchatelet <skygreg@gmail.com>
Date:   Tue Nov 27 10:13:08 2012 +0100

    Removing this plugin from this branch.

commit 15400fffe643ad3e66d6b5a296fe62d36d9a617a
Author: Gregory Duchatelet <skygreg@gmail.com>
Date:   Tue Nov 27 09:53:16 2012 +0100

    Enhance _match function in inventory with regex.
    --limit ~regex could be used to filter hosts or group with a regex.
    Tested on cli and ansible-playbook.

commit 63c1b2e17ec6daa282e0a3af2249bda8f734dcd3
Author: Gregory Duchatelet <skygreg@gmail.com>
Date:   Tue Nov 27 09:03:41 2012 +0100

    Revert pull request #1684

commit 7c2c6fee3a856c52c1960b96ec2e7ca1112c35a1
Merge: f023a2f dd5a847
Author: Gregory Duchatelet <skygreg@gmail.com>
Date:   Tue Nov 27 08:52:53 2012 +0100

    Merge remote branch 'upstream/devel' into devel

commit f023a2f3df4a4c2ab2dfcc5aa42c57c02358a47a
Author: Gregory Duchatelet <skygreg@gmail.com>
Date:   Mon Nov 26 20:52:27 2012 +0100

    Add an inventory plugin to fetch groups and host from our CMDB.

commit c64193b4c67053e6e197b89c7143b9770cf71f23
Author: Gregory Duchatelet <skygreg@gmail.com>
Date:   Mon Nov 26 20:43:30 2012 +0100

    Added possibility to filter hosts from a group, with a regex, separating
    groupname and regex with a ~
    Usage in group pattern: group~filterpattern
    Samples:
    ansible group~server-0[1236] -m ping
    ansible web~proxy -m ping
    ansible web~(proxy|frontend) -m ping
Add a unit test to subset limiting via a regex, and some doc in man
page.
Moved docs about "--limit=~REGEX" from man page to asciidoc.
add --list-hosts support to bin/ansible

add error handling when no arg passed to command module
print Notes heading only if there are any
Fix ppa syntax in apt_repository module doc

The example for using a ppa had the wrong syntax.

Ironically, the correct syntax is illustrated in a comment on line 23.
Tweak docs for correct paths and filenames
Allow intersecting host patterns by using &

This allows patterns such as webservers:!debian:&datacenter1 to target
hosts in the webservers group, that are not in the debian group, but are
in the datacenter1 group. It also parses patterns left to right.
pip module improvements
- Do not silently ignore malformed pip requirements files.
- Properly reports changed when removing packages.
- "latest" i.e. --upgrade is *not* incompatible with requirements files.
- Less branchy, simpler logic.
- Removed pointless variable "initializations", Python doesn't need that.
  Other code simplifications.
- Fun fact; pip install is (kind of) case insensitive, pip freeze is not.
  So, 'sqlalchemy' will be reported as installed by install, but missing
  by freeze.

The perhaps controversial change and the one that led to finding /
fixing above issues...

Instead of adding command parameters 'index', and 'find', and 'mirrors',
and etc.  Added 'extra_args' which are passed onto pip.

The use case for --index-url is having a private pypi repo, like
http://pypi.python.org/pypi/localshop, to which you publish private
packages.  I'm sure most every pip option has a use case for someone.
extra_args handles all those. Can reserve ansible command parameters for
the most common.

Tested with pip 1.1.
Merge pull request #1756 from marktheunissen/fix-ec2-inventory-path

Tweak docs for correct paths and filenames for ec2 inventory
Merge pull request #1764 from njharman/pip

pip module improvements
Merge pull request #1749 from jpmens/andoc3

ansible-doc: print Notes heading only if there are any
Merge pull request #1755 from lorin/patch-1

Fix ppa syntax in apt_repository module doc
Merge pull request #1750 from dhozac/intersection-host-pattern

Allow intersecting host patterns by using &
Merge pull request #1696 from gregorg/enhance_limit

Allow regex to be used to select hosts in addition to fnmatch pattern
Merge pull request #1741 from christopher-snapp/list-hosts

add list-hosts support to bin/ansible