Fix TOC links in API documentation
Define latest error codes, change existing code structure to use them.
Send error.serviceUnavailable when we're too busy.
Intercept hawk errors, transform into custom format.
Merge pull request #246 from mozilla/fix-toc-in-api-doc

Fix TOC links in API documentation
Use application-level Error objects in the Model classes.

This avoids introducing boom and hoek as dependencies of the client lib.
Ensure all errors have an 'errno' attribute.

In the absence of something specific, use 999 for "unspecified error".
Cleanup static IDP-related views, and add some basic tests.
Change provision/signin pages to be simple placeholder text.

We really don't want people trying to sign into this thing like it's
a normal BrowserID IdP.
Merge pull request #248 from mozilla/rfk/detailed-error-codes

Implement detailed error codes
Merge pull request #252 from mozilla/rfk/static-views-cleanup

Cleanup static IDP-related views, and add some basic tests.