[bug/use-rails_deploy_git_version-variable]

Fixed a bug where the rails_deploy_git_version variable wasn't being
used correctly
[remove-postgres-dependency]

When using the role on a MYSQL app, the postgres library was
still automatically installed. ImageMagick was also similarly
needlessly installed.

I've thus moved the dependencies to a variable, and included an
example for postgres and imagemagick.
[rails_deploy_ssh_keypair_copy] Allow users to disable SSH keypair copies

Added new rails_deploy_ssh_keypair_copy parameter. This lets users
disable ssh keypair copies if they have another role that manages
the process.
Merge pull request #4 from unboxed/remove-postgres-dependency

[remove-postgres-dependency]
Merge pull request #3 from unboxed/bug/use-rails_deploy_git_version-variable

[bug/use-rails_deploy_git_version-variable]
Merge pull request #1 from unboxed/make-ssh-keypair-copy-optional

[rails_deploy_ssh_keypair_copy] Allow users to disable SSH keypair copies
 [add-support-for-templates-and-config-files]