Reopen a need: Model code and Unit tests
Rename needs to be more consistent
Add new revision action type
Rename `main_need` to `canonical_need`
Add controller code and functional tests for reopening needs
New route and integration tests for reopening needs
Add refutation of canonical need having duplicates
Don't reload need when rendering nothing
Fix spelling mistake
Merge pull request #41 from alphagov/unmerge-needs

Unmerge needs