[cli] Changes `fog --version` short option to `-v`

Looking at a number of similar Ruby based tools, Bundler, Rubygems, Pry
and IRB all use lowercase v for the short option for `--version`

Ruby itself uses `-v` for verbose but without any further arguments
prints the version and exits.
Merge pull request #1927 from fog/change_version_short_option

[cli] Changes `fog --version` short option to `-v`
Merge pull request #1928 from adamjt/publicly_accessible_rds

Add PubliclyAccessible option to RDS.
increased iops limit to 4000. http://aws.typepad.com/aws/2013/05/provision-up-to-4k-iops-per-ebs-volume.html
Merge pull request #1938 from opsengine/develop-iopslimit

[AWS|EC2] Increased IOPS limit to 4000.
Bump RDS version to support PubliclyAccessible.
Merge branch 'publicly_accessible_rds' of github.com:adamjt/fog into publicly_accessible_rds