Three changes:
* Add set_default_selinux_context() to module_common that sets
  a file's context according to the defaults in the policy
* In atomic_replace(), set the default context for the file if
  selinux is enabled and the destination file does not exist.
* In authorized_key, set the default context when creating
  $HOME/.ssh and $HOME/.ssh/authorized_keys.  If these already
  exist, this won't touch them.

Missing colon in $FILE example docs

Subverion module improvements

mail module: add MIME attachments, port and addresses with phrases

add list-hosts support to bin/ansible

Allow regex to be used to select hosts in addition to fnmatch pattern

Allow intersecting host patterns by using &

Fix ppa syntax in apt_repository module doc

ansible-doc: print Notes heading only if there are any

pip module improvements

Tweak docs for correct paths and filenames for ec2 inventory

- 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.

if user has manually installed an intermediate version - don't ignore it...

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.

make --list-hosts expand out extra vars in the hosts: field

 Add HTML-escaping to code examples in rST tempate of module-formatter
 Add support for specifying port, addresses with phrases and attaching files
 Add support for custom headers and document version_added for new options
 X-Mailer header added :)
 protect empty address lists & attachment list, and add bcc

The example for using a ppa had the wrong syntax.

Ironically, the correct syntax is illustrated in a comment on line 23.

  - Added username, password arguments.
  - Documented existing revision argument.
  - Corrected documentation/docstrings; removed git references, use svn
    nomenclature, etc.
  - Refactored duplicate code, redundant shell calls, filter abuse,
    inconsistent formating, etc.
  - Shell quoting so it doesn't break for one guy who has spaces in
    pathnames.
  - svn called with '--non-interactive' and '--no-auth-cache'.

CLI: ansible-doc rebased

add error handling when no arg passed to command module

added support for scheduling downtime for all services on host

supervisorctl: document the 'present' option

Fix "NameError: global name 'name' is not defined" exception

Further refine remote branch tracking in b1ec6e81

Move operations that are dependant on a remote branch under a if
is_remote_branch() conditional.  While at it, remove assignment to cmd
string in same block that wasn't used when calling _run().

Fix git module to update branch to latest when using version=<branch>

The git module would not pull in updates to a branch when
version=<branch>.  This updates that block to checkout the branch
and then do a git reset --hard <remote>/<branch>.  This
should now track updates to a branch.

Import errno to avoid 'NameError: global name 'errno' is not defined'

I hit the following exception because errno is referenced but not imported.

```
fatal: [system01] => failed to parse: Traceback (most recent call last):
  File "/root/.ansible/tmp/ansible-1354644532.37-246102819320352/copy", line 782, in <module>
    main()
  File "/root/.ansible/tmp/ansible-1354644532.37-246102819320352/copy", line 117, in main
    module.atomic_replace(dest_tmp, dest)
  File "/root/.ansible/tmp/ansible-1354644532.37-246102819320352/copy", line 772, in atomic_replace
    if e.errno != errno.EPERM:
NameError: global name 'errno' is not defined
```