minor: remove dummy dependency in engine test_helpers

This was causing problems with zeus
stay on all tickets view when sorting (#5879)

When an admin sorted the tickets view in a different order it would take them to their own tickets list before
minor: cleanup some links

only submit the params that differ from the defaults
only use user ticket(s) path for real users
adopt ticket list test to new behaviour

We completely ingnore the user_id param for non admins now. So if someone tries to show somebody elses tickets they will see their own instead.
Merge pull request #174 from azul/bugfix/admin-navigates-all-tickets

Admin navigates all tickets - fixes #5879
Added allow_registration toggle.

- default is true
- See issue #5217
- See companion change in leap_platform.
Merge pull request #178 from fbernitt/issue_5217_allow_registration

Added allow_registration toggle.
store expiry with cert fingerprints

We used to store the creation date but this way it's easier to query for non expired certs
Identity view cert_fingerprints_by_expiry

Also move complex identity views into js designs.
Includes test.

Here's how you would query it from outside rails:
```
$ curl
'localhost:5984/identities/_design/Identity/_view/cert_fingerprints_by_expiry?startkey="2014-07-05"'
{"total_rows":4,"offset":1,"rows":[
{"id":"6c9091d4f13eaeaa6062c9d0528fd34d","key":"2014-07-05","value":"fingerprint"},
{"id":"6f3aa93828b4f6978d551f2623b9d103","key":"2014-07-05","value":"fingerprint"},
{"id":"b6cafacfa65042679691cd5065fb19e3","key":"2014-07-07","value":"fp"}
]}
```

Note that the expiry will be used as the key. So you should use the
current data (or yesterday) as the startkey to get all fingerprints that
have not expired yet.

The fingerprint itself is in the value. No need to include docs.
fix tests and simplify time calculations
minor: fix typo in load_views

It removed most of the reduce functions... really not what we wanted
allow querying for the expiry of a particular fingerprint
Merge pull request #175 from azul/feature/view-for-valid-certs

Feature/view for valid certs
Moved check for allow_registration into filter.
Merge pull request #179 from fbernitt/issue_5217_addendum

Moved check for allow_registration into filter.
rename warden extension to patch the original

the Warden::SessionSerializer was not getting loaded at all because we had a file by the same name. We want it to get loaded and be patched instead.
separate login_required from access denied response

They are very different. Let's handle them in different methods.
SessionsController#unauthenticated for 401s

Warden will catch all 401 responses at the rack level and call the app for failures. By default that is SessionsController#unauthenticated.

I'm sticking with this. If we ever have other rack endpoints they can just send a 401 and the webapp will take care of the message.

Other options would have been to tell warden not to take care of 401 either during initialization or by calling custom_failure! in the login_required method.

We probably want a response that has a unique identifier for the error to process by the client and a translated message later on. For now i think the 401 suffices to identify the issue at hand.
render valid json error if provider file not found