Update contribution instructions in README.md

Old instructions weren't being followed.  However, system currently in
use seems to be working for now.  Bringing docs in-line with current
practice minimizes impedance mismatch between new contributors and
existing maintainers.
Add API unit-level tests.

Previous API had no tests, but I didn't think they needed any as I'd be
testing the compiler at that point.  However, over time, features
accreted, and the time has come for tests to be written.

Many thanks to Mark Peek for this contribution!
Retrofit request() to return HTTP.Response

Direct access to arbitrary headers is a significant concern for many
OpenStack APIs.  The current API does not offer this access.
Retrofitting request() to grant access to the raw Response is the first
step towards achieving this goal through the public API.

It should be noted that the public API does not yet expose this
functionality.  This will be addressed in a separate commit.
gofmt
Merge pull request #10 from racker/expand-api

Expand api

Update contribution instructions in README.md …
Old instructions weren't being followed.  However, system currently in
use seems to be working for now.  Bringing docs in-line with current
practice minimizes impedance mismatch between new contributors and
existing maintainers.

Add API unit-level tests. …
Previous API had no tests, but I didn't think they needed any as I'd be
testing the compiler at that point.  However, over time, features
accreted, and the time has come for tests to be written.

Many thanks to Mark Peek for this contribution!

Retrofit request() to return HTTP.Response …
Direct access to arbitrary headers is a significant concern for many
OpenStack APIs.  The current API does not offer this access.
Retrofitting request() to grant access to the raw Response is the first
step towards achieving this goal through the public API.

It should be noted that the public API does not yet expose this
functionality.  This will be addressed in a separate commit.