Sketched out the absolute basics of the login/signup activity: it displays the two things as tabs, devolving their content to fragments, which are presently empty.
The login fragment now creates or finds the named used (locally; web service information yet to come) and then passes them to the business form activity.
Added a couple of helpful comments.
Added appropriate layout for the signup activity, fixed a backwards compatibility issue with login. I'd argue there's no point writing signup code yet.
This should actually search by email address, and should record the thing if creating.
Let's supply the test user from the test button.
Merge pull request #20 from martasmith/thomasharte/LoginActivity

Thomasharte/login activity