correct some formatting

S-47060
requests to create a digest return a valid url for the digest.

S-47060
a digest is identifiable by a uuid on the url

S-47060
bring in chai, and alphabetize variable setup for the test file.

S-47060
replace assert usage with chai should style bdd bits.

S-47060
dry up the post to the digest endpoint in the tests

S-47060
rename of the parameter callback to postDigest

S-47060
start sending back a json object to contain hypermedia

S-47060
after creating a digest, you can access relevant links to other things.

S-47060
retitle test

S-47060
the response from creating a digest should contain a rel to go create
an inbox

S-47060
the method to access the inbox-form is via a an http GET
A second style for accessing the inbox-form link from the response of
creating an inbox.

It's debateable which style is better. I thought about this style because
doing it this way removes you from having to know what position in the
_links array the inbox-form link is. knowing the position seemed to me too
tightly couple the test to the implementation.

I've left both in the tests to have a chat with folks about their
opinions.
there should be a reference to the inbox form endpoint.
Make the id of a digest explicit in the response.

Refactor some tests.
Add some documentation to the digest endpoint.
An inbox form endpoint.

In creating the inbox controller, there was a need for a different method of testing.
Rather than testing the request/response lifecycle of express, I needed to
test the hypermedia specifically. The problem was that I was having trouble getting
the protocal and the hostname off the response. Extracting the creation of the hypermedia
out of the route definition and into a function on it's own enabled passing parameters
into the construction of a hypermedia response, and more testable.
Perhaps there still needs to be a test that checks that inboxController.constructHypermedia is called when you
hit the route? Perhaps this approach is misguided? Looking for thoughts.

S-47060
link for an inbox form as a result of digest creation should have
a description

S-47060
remove commented out code

S-47060
remove redundant test that was being kept around for comparison of ways
to accomplish said test.

S-47060