Initial Version

This release includes the baseline functionality needed for the BOSH director.

Future releases will be just a tag. A tag of vx.y.z has their binary located at

 https://s3.amazonaws.com/bosh-gcscli/bosh-gcscli-x.y.z-linux-amd64

For example, v0.0.2 has its binary located at

 https://s3.amazonaws.com/bosh-gcscli/bosh-gcscli-0.0.2-linux-amd64

In the future, it is possible to switch from just tags to full releases with the binary, see #14 for more.