…st practices

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…d abilities to meet specs.

…sation)

- remove redundant conditional

- remove redundant things

…o be able to create a new team

-PM rspec green

…ot read a user's email address when it's marked as hidden

-PM rspec green

… desired behaviour

- Added new specs to described the intended behaviour whether a supervisor should or should not read hidden email addresses.

- PM rspec green

…lappradla

-PM rspec green

…ut solving the issue :-)

- Unchanged: a student cannot create a second team in one season, and can create a team in next season
- Fixed: a student in a team in current season doesn't get the '+ new team' button
- Fixed: a student in a team in current season has no access to the new team form
- Driving by: use the new rails 5 redirect-er to redirect back to the referer or fall back to root. (So that the forbidden access message appears on the page where the user tried something forbidden.)
- Update projects_spec for new redirect
- Update teams_controller_spec that failed because a student can't create a second team in the same season

…n of testing role abilities.

… in this PR