Region interface can now query cloud for flavors.

Support for the flavors/ endpoint added to the Region interface.
The code is structurally quite similar to the Images code.

As an aside:

I'm beginning to think that Region, et. al. should not be interfaces.
It's not very Go-like, and it seems like I should be doing something
different.  But, I'll defer future refactoring for a different patch.

Squashed commit of the following:

commit 491b1b215bd7ebc5c9411a84b5b426eb18c4d6d1
Author: Samuel A. Falvo II <sam.falvo@rackspace.com>
Date:   Fri Apr 26 17:21:26 2013 -0700

    Test refactoring

commit 3425c485de631e2ef4f63fbddf6677f5f35ac8f0
Author: Samuel A. Falvo II <sam.falvo@rackspace.com>
Date:   Fri Apr 26 16:55:33 2013 -0700

    godoc comments

commit bf8c06daf6a6faa1a0485412eac8fc0c60cdb0f9
Author: Samuel A. Falvo II <sam.falvo@rackspace.com>
Date:   Fri Apr 26 16:46:42 2013 -0700

    Source code formatting

commit 0722f4f14da425470082f4386759ecb8dafda8c4
Author: Samuel A. Falvo II <sam.falvo@rackspace.com>
Date:   Fri Apr 26 16:45:16 2013 -0700

    Code for listing flavors added.
Merge pull request #13 from racker/list-flavors

Region interface can now query cloud for flavors.
Bug fixes and initial cloud server support

This commit refactors the RESTful accesses into a new project, called
perigee.  Perigee is intended to abstract all HTTP-level accesses.
Perigee is an open-by-default project.

Gorax itself now supports listing a set of servers.  Much of the
groundwork for creating servers now exists via the Perigee project as
well.

Documentation is improved as well.

Squashed commit of the following:

commit 35223e7d4ac5462484e7d542f11ab178460f3ef5
Author: Samuel A. Falvo II <sam.falvo@rackspace.com>
Date:   Thu May 2 16:37:40 2013 -0700

    Bug fixes and initial support for cloud servers.

commit 5b4024d1745fecbb952c08275862c06b58bfa135
Author: Samuel A. Falvo II <sam.falvo@rackspace.com>
Date:   Thu May 2 13:55:43 2013 -0700

    Updated to use new Get/Post in perigee.

    Many of the parameters provided are technically optional in the generic
    REST call sense, so they've been moved to an Options structure.

commit 7d8ae928c95f37c25df34258a14f9548f575c986
Author: Samuel A. Falvo II <sam.falvo@rackspace.com>
Date:   Thu May 2 13:16:58 2013 -0700

    Cleaning up redundant code
Merge pull request #14 from racker/hackday_refactoring

Bug fixes and initial cloud server support
Travis integration
Travis-ci integration into the readme
Thinko in the URL.