refactoring: grouped association tests and validation tests
created rspec tests for Assignment#section_due_date
created/refactored tests for Assignment#past_due_date?
refactor: removed brackets around eq matcher
created Assignment#latest_due_date; reworded examples to be more explicit
restructured/added additional testcases for Assignment#section_due_date
rspec tests for Assignment#section_past_due_date (and moved #latest_due_date method)
removed migrated tests
removed migrated test
rewrote Assignment#what_past_due_date rspec tests
refactored matchers that should be strictly boolean
rewrote #section_due_date
Merge branch 'master' of git://github.com/MarkUsProject/Markus into rspec-tests
fixed some houndci complaints
fixed some more houndci complaints
fixed houndci complaints
fixed houndci complaints
Merge pull request #1911 from kubasub/rspec-tests

Rspec tests