Lookup plugins do not warrant settings in ansible.cfg.

I get errors like this with etcd_url = 'http://127.0.0.1:4001':
urllib2.URLError: <urlopen error unknown url type: 'http>

with support for configurable etcd URL in ansible.cfg (and environment)

Using ANSIBLE_ROLE_PATH environment variable or role_path in ansible.cfg
can configure paths where roles will be searched for
extra paths will only be used as a backup once regular locations are exhausted

Also removing the ControlPath option, as it will now be auto-generated
if the ControlPersist option is set in the arguments.

Came to here from http://www.ansibleworks.com/docs/bestpractices.html, but I think the link here meant to go to https://github.com/ansible/ansible-examples and not https://github.com/ansible/ansible-examples/tree/master/language_features?

Make it possible to tell paramiko to not record new host keys, which can be slow with a large number of hosts.
-c ssh is preferred in most cases if you have ControlPersist available, otherwise if you are comfortable you
can turn off recording while leaving host key checking on, etc.

Makes host key checking the default behavior but can be disabled in ansible.cfg or by environment variable.

Updated the example ansible.cfg to be more consistent in spacing/commented lines

remote_user should not be set in example config. This file is used in rpm .spec for /etc/ansible/ansible.cfg

Previous commit made config invalid.

commit c36b66dc952dfff91043ecbca56cf3f1f8f00703
Merge: 240d7bf1 f4cf934
Author: Michael DeHaan <michael@ansibleworks.com>
Date:   Tue Jun 18 13:04:51 2013 -0400

    Merge branch 'unevaluated-vars' of git://github.com/lorin/ansible into lorin_undefined

    Conflicts:
    	lib/ansible/runner/__init__.py

commit f4cf93436767f73b62a16067ab5e628830045896
Merge: 2531440 07a1365c
Author: Lorin Hochstein <lorin@nimbisservices.com>
Date:   Thu Jun 6 11:07:41 2013 -0400

    Merge branch 'devel' into unevaluated-vars

commit 253144045cbafd7d72836f1017c62ac4ba623186
Author: Lorin Hochstein <lorin@nimbisservices.com>
Date:   Thu Jun 6 11:06:37 2013 -0400

    Fail template from file on undefined vars

    If config option is set, raise an exception if templating from a
    file and a variable is undefined.

commit aecb71d8b75257f0f3e11a9b176fc3737aecef8d
Author: Lorin Hochstein <lorin@nimbisservices.com>
Date:   Wed Jun 5 17:12:12 2013 -0400

    Add fail_on_undefined flag

    Add a fail_on_undefined flag to the template and template_from_string methods.

    If this flag is true, then re-raise the ninja2.excpetions.UndefinedError instead of
    swallowing it.

commit cbb1808f0585f01536240aee05a1bfd06c4b4647
Merge: d4bbf49 41425fb5
Author: Lorin Hochstein <lorin@nimbisservices.com>
Date:   Wed Jun 5 16:14:12 2013 -0400

    Merge branch 'devel' into unevaluated-vars

commit d4bbf492b0b63c789d66ab60d0ec634d100fca82
Author: Lorin Hochstein <lorin@nimbisservices.com>
Date:   Mon Jun 3 19:46:13 2013 -0400

    template: Raise UndefinedError exception

    In template_from_string, raise an undefined error if it occurs.

    Have the caller catch it and throw an AnsibleUndefinedVariable

commit c94780280515f1f3756fdc429b2b1e87b365e9b7
Merge: 8d919d6 be33bcf1
Author: Lorin Hochstein <lorin@nimbisservices.com>
Date:   Mon Jun 3 10:09:43 2013 -0400

    Merge branch 'devel' into unevaluated-vars

commit 8d919d6c97b28a42f47ca7248c542695baf6175f
Merge: 0f68ad8 b8630d2b
Author: Lorin Hochstein <lorin@nimbisservices.com>
Date:   Thu May 30 16:27:48 2013 -0400

    Merge branch 'devel' into unevaluated-vars

commit 0f68ad8193ac17488e339a258f8c63fdae399c26
Author: Lorin Hochstein <lorin@nimbisservices.com>
Date:   Thu May 30 14:32:03 2013 -0400

    Optionally fail task on undefined variables

    This patch introduces a new configuration option called
    error_on_undefined_vars, which defaults to false.

    If this option is set to true, then a task which has unevaluated
    variables in its arguments will fail instead of running. Output looks
    like this:

        TASK: [set rabbitmq password] *************************************************
        fatal: [10.20.0.7] => Undefined variables: rabbitmq_user, rabbitmq_password

Don't set PasswordAuthentication=no here because the connection plugin will do that unless a password is actually specified with -k/--ask-pass.

remove playbook examples from main repo.  Fear not, these are now in the ansible/ansible-examples repo :)