Fix typo from method name
Use #alert helper when refering to flash[:alert]
Remove :error key in controllers

Use flash.alert, the default for errors.
Remove :failure key in controllers

Use flash.alert, the default for errors.
Remove :success key in controllers

Use flash.notice, the default for errors.
Use #notice helper when refering to flash[:notice]
Set "notice" as default css class for successful flash messages
Migrate missing references of flash[:failure] and :success to helper methods
Remove :notice_confirmation key in controllers

Use flash.notice, the default for notices.
Move flash messages to html helper
Remove spectator-validates_email gem close #41
Remove schema_associations from authorization model
Remove schema_associations from channels
Remove schema_associations from company contact
Remove schema_associations from contribution
Remove schema_associations from notifications
Remove schema_associations from oauth providers
Remove schema_associations from payment notifications
Remove schema_associations from projects
Remove schema_associations from rewards