Additional fields on the Sponsorship application form

'Add additional questions to Sponsor Signup form: “Phone Number*”, “Address*”,
“Does your organization want a booth on the expo floor?”, “Does your
organization want a table at the job fair?”, & Date/Time stamp of when the
sponsorship application was approved.'
Move sponsorship tests into a directory
get_or_create Conference in sponsorship tests

These tests were running as part of the whole suite, but not on their own.
Additional test factories
get_full_name is a method
Test utilities
Test for sponsor application form and view
Unit tests & fixes for sponsor approval timestamp
Merge remote-tracking branch 'origin/develop' into sponsorship-fields
Change address to a TextField
Merge pull request #287 from PyCon/sponsorship-fields

Additional fields on the Sponsorship application form