Encapsulate "need in scope?" logic in a method
Don't send the 'in_scope' flag to the Need API

This is superceded by the 'status' attribute.
Stop using Need#out_of_scope_reason

Use Need#status instead.
Remove obsolete Need#out_of_scope_reason
Merge pull request #127 from alphagov/dont-use-in_scope-and-out-of-scope-reason

Use Need#status instead of Need#in_scope and Need#out_of_scope_reason