Add ec2_elb_lb for managing ELBs
Add health check parameter.
New lookup plugin csvreader
Added existing_only options to skip creating new files on receiver
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.
Don't modify hgrc when running purge
Initial commit of rax_dns module
Add state attribute to description
Remove errant raise
Initial commit of rax_dns_record
Add ec2_key module.
Minor typos and remove extra dependencies.
Add ability to specify a VirtualIP ID for sharing a VIP with another LB
Add version_added for vip_id
Added ability to start and stop existing EC2 instances.
Bumped to v1.5
Added to the file module the functionality to force conversion hard link and symlink when the force attribute is set to 'yes'
Initial commit of rax_keypair