Candidacy application, changed status query

Implemented candidacy application query (user and candidate information
returned on success)
Login now returns user and candidate information for the user
Status query returns user and candidate information for current user
Null's are serialized in JSON now.
Added method to JsonQueryInfo for getting current user's candidate info.
Candidate name now has separate first and last name.
Added some test data to database.
Changes in data and queries reflected on query test page.