Add sign up button to provider details
Current flow:
- see list of providers
- select one or add one
- in provider details there is option to log in
- select log in, now there is option to sign up
Typically, a user who wants to sign up would not think to click 'log in' first. So, a 'sign up' button should be added to provider details, if the provider.json allows sign ups.
(from redmine: created on 2014-07-01, closed on 2014-08-05)