Signed-off-by: David Seaward <david.seaward@puri.sm>

handle user delay between subscription and registration (#58):

See merge request purist/middleware!61

* delete unconverted user credit (triggers a new attempt)
* ask new registrants to refresh page after 5 mins

project tidying:

* update project links (source.puri.sm)
* update copyright bylines (just "Purism SPC")
* update README
* switch to pipfile-based dependencies and minimally update dependencies according to pipenv reports
* update references to requirements.txt (still used for regular installs)
Signed-off-by: David Seaward <david.seaward@puri.sm>

* update project link
* update copyright line (include 2018)

* define get_username_from_woo_customer_id
* FIXME: hardcode ID for subscription parser
* filter for known product IDs
* fix parser name in display
* update config to match new requirements
* tweak setup instructions to match updates

* define Container abstraction for new maps

* use Services enum in profile view
* fix jwt_status typo

(existing usernames that are invalid will not authenticate)

* do not recreate certificate if it already exists
* use new Service class

* fix reference to new enum
* add months and years to label