E1844 Issues related to names

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Issues to be fixed

Issues as described by the problem statement:

Issue #842: Team names created by bidding are incorrect Somewhere in the bidding code, or the code that assigns topics based on bids, team names are generated. In this case, team names are not appended to the name of the assignment, like they are when teams are created elsew

Issue #982: Usernames can have spaces in them. And currently, if you create a user with a space in the username, you can't impersonate that user. Expertiza should prohibit spaces in usernames. Implementation should probably just include a format check in the user model, and tests to validate a username.

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Modified Files for fixing issue #842

1) app/controllers/lottery_controller.rb

2) app/controllers/suggestion_controller.rb

3) app/models/team.rb

4) spec/models/team_spec.rb

Modified Files for fixing issue #982

1) app/models/user.rb

2) spec/models/user_spec.rb

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