Documentation updates.
Added volume sizing note to create_volume's SnapshotId option.
Update version number, update changelog.
Revert "Update version number, update changelog."

This reverts commit c4253e8186348e389366c3901eb3d74f9b94a9ef.
Merge branch 'master' of https://github.com/mrallen1/net-amazon-ec2
Added allocate_vpc_address to allocate VPC scope addresses. It would be cleaner to update allocate_address but this would break existing code.
Merge pull request #34 from unixtastic/master

Add allocate_vpc_address plus minor documentation changes.