Simple module to install Perl libraries via cpanm.

cpanm is a popular alternative to the CPAN client for installing Perl
libraries.  Unfortunately it can't uninstall already installed module, so it
can't handle states.
Add the `mirror` option and verify if a package is already installed.

By default, the cpanm client will use a default mirror to download
libraries, but it's possible for the end user to pass a different URL.

Since ansible favorite idempotence when possible, we verify if the
module is already installed before running the cpanm client.

Another minor additional change, the `notest` option is now a boolean.
Alias name to pkg.
Add ec2_elb_lb for managing ELBs
Add health check parameter.
changing permissions of modules to 0644
Made URL an optional parameter
Added module to handle rabbit policies [1]

Used quite a bit of the existing rabbit modules provied by @chrishoffman.

[1] https://www.rabbitmq.com/parameters.html
Cleaned up docs just a smidge

Mostly added periods where missed, and corrected /vhost spacing.
use new airbrake API URL
The setting of params via dict or string by tags

Updated per @mpdehaan suggestions.
* Rather than passing in JSON, supply the policy options as a hash
  or string.
* Bumped version_added to 1.5.
Handled string/dict the ansible way
New lookup plugin csvreader
Added existing_only options to skip creating new files on receiver
synchronize: allow ansible_ssh_host to be templated

This is already enabled in the runner also.
Added -FF flag to rsync invocation in synchronize

The `-FF` option causes rsync to look for files in the source directory named `.rsync-filter` and uses them to filter directories underneath them. If no `.rsync-filter` files are found, the behavior is identical to the command run without the -FF option. This flag does not sync the .rsync-filter files themselves.

This change should be backwards compatible and not produce surprising behavior for users, since they are unlikely to create `.rsync-filter` files unintentionally.
Added note about .rsync-filter files, with example
Fixed a typo.
Optionally unarchive a file already on the remote machine
Don't modify hgrc when running purge