A couple fixes for the file module

Raise exception when sudo user does not exist

Revert acceptance of directory as dest for copy

Although library/copy can be corrected to understand that dest is
a directory, I can't see how to let _execute_copy know this and let the
file module know.

As a better solution than before #733, the copy module now explicitly (rather
than silently) fails when dest is a directory.

sudo can fail before getting to the password prompt if a user does not exist
<pre>
[will@tangerine ansible (sudo_missing_user)]$ sudo -u bobbins echo hello
sudo: unknown user: bobbins
sudo: unable to initialize policy plugin
</pre>
Fix raises a distinct exception when that occurs

secontext is used internally and should not be in argument_spec

Join with_items for the apt module, yum pending, and various fixes to the yum module to support aliases

Implement git commit date into RPM release

added an 'ignore_errors' option to tasks

Enable apt module to handle multiply packages (comma separated)

Issue755 - fixes for service module

Smiting Debian packaging instructions that did not work

them with the correct instructions. Changing file to .md to match 'docs'
file.

If _do_enable() is run and returns rc == 0, set changed=True
Add enabled and state to result if they are supplied when the module is
run.

Allow use of service module with just enable parameter, per issue #755.
Also fixed two other issues:
- fixed parameter to be 'enabled' per docs, not 'enable'.
- fixed if block that checks whether to run _do_enable() to check
  whether the parameter is set, not the value of the enable value which
  may be None or False.  If enabled=no, the service would never be
  disabled.

Failed tasks with ignore_errors=True, allow the remaining tasks in the
play to be executed as if no failure happened. A failure notice is still
written to the output as well as an '...ignoring' message.

get_url except fix

So we get the exact behavior as the SRPM build

With this patch one can do `make rpm` and get an RPM file that looks like:

  rpm-build/noarch/ansible-0.6-0.git201208010541.el6.noarch.rpm

My goal was not to rewrite the original SPEC file, and/or the tarball. In other
projects what I tend to do is prepare the SPEC file in the tarball with the
correct version/release so that rpmbuild works on the (released) tarball as
well. If this is wanted, we will have to rewrite the SPEC file on the fly as
part of creating the tarball. If there is no git or .git/ available, we will
use the current time.

Allow = symbols in variable values in host inventory

fixing test_one

on_skipped callback being passed an extra item parameter that it wasn't
expecting.
Fixed it so that on_skipped in TestCallbacks accepts and ignores the
extra parameter
Extra parameter was added in 4b9b9a8a
but not really clear why from commit message

Teach the common module code to warn users about typo'd arguments and also set everything to None automatically such
that code doesn't have to do a lot of params.get('foo', None) everywhere.

concatenating stdout and stderr in runner/__init__'s _low_level_exec_command