Add ec2_elb_lb for managing ELBs
Add health check parameter.
Fix setup.py to work with 'pip install -e .'
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.
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
postgres_db CHECKMODE changed status

Make the changed status for postgres_db under CHECKMODE match the
status that would be returned normally.
Fixed a typo.
Don't modify hgrc when running purge
Allow multiple users to use ec2 inventory scripts

Move the ec2 cache files from a shared /tmp location to the
user's ansible tmp directory.
`file` module: Don't catch `SystemExit`

This fixes issue #5159.
module(apt_key): don't catch `SystemExit`

If we do this, we risk outputting two JSON payloads, which will be
unparsable.
module(nagios): don't catch `SystemExit`

If we do this, we risk outputting two JSON payloads, which will be
unparsable.
`env-setup` fix for zsh <= 4.3.10

This fixes issue #5026. It used to work. The regression was
introduced in 2b3381de7c6e0924b29123c33f0627a12418f2c8.