Migrations fixed
Merge pull request #12 from instructure/user_tests

Student and teacher account type tests.
Migrations fixed
MERGE RAWR
Merge pull request #13 from instructure/fix_migrations

Migrations fixed
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Merge pull request #15 from instructure/DeletedDateFromNotebook

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notebook comments
update root index
refactor comment views
deleting comments
add valid attributes to controller spec
remove files
remove comments helper spec
merge conflict resolved