Raise 404 when ApiTeamDetails can't find a team
ApiTeamsShow: if one key cannot be found, 404
ApiTeamsShow: 404 if one team not found
Add test case for 4ec15ecb60.
Fixed testNonexistentTeam failure.
Add test for ApiTeamDetails.
Use literals instead of constructors.

See:
http://stackoverflow.com/questions/6610606/dict-literal-vs-dict-constructor-any-preferred
Merge pull request #677 from kuyan/patch-1

Raise 404 when ApiTeamDetails can't find a team