Subject Common Names can now also be configured to be allowed or
denied, similar to SANs. When a Subject Common Name is not explicitly
allowed or denied, its type will be determined and its value will be
validated according to the constraints for that type of name (i.e. URI).
* api/render: initial implementation of the package
* acme/api: refactored to support api/render
* authority/admin: refactored to support api/render
* ca: refactored to support api/render
* api: refactored to support api/render
* api/render: implemented Error
* api: refactored to support api/render.Error
* acme/api: refactored to support api/render.Error
* authority/admin: refactored to support api/render.Error
* ca: refactored to support api/render.Error
* ca: fixed broken tests
* api/render, api/log: moved error logging to this package
* acme: refactored Error so that it implements render.RenderableError
* authority/admin: refactored Error so that it implements render.RenderableError
* api/render: implemented RenderableError
* api/render: added test coverage for Error
* api/render: implemented statusCodeFromError
* api: refactored RootsPEM to work with render.Error
* acme, authority/admin: fixed pointer receiver name for consistency
* api/render, errs: moved StatusCoder & StackTracer to the render package
Refactored some of the existing bits for testing the Authority
API by creation of a new LinkedAuthority interface and changing
visibility of the MockAuthority to be usable by other packages.
At this time, not all of the functions of MockAuthority it usable
yet. Will refactor when needed or requested.
