Adds ability to "lock" activities [#49884051]

If the `is_locked` attribute is set to "true", non-admin authors cannot edit or copy the activity. Only admins can lock an activity; admin users can copy and edit activities as usual.

https://www.pivotaltracker.com/story/show/49884051
Adding "notes" to LightweightActivities [#49884051]

https://www.pivotaltracker.com/story/show/49884051
Adds numbers to questions in summary view

For [#49854337]. Needed to put in empty spaces for non-answers to make the layout work.

https://www.pivotaltracker.com/story/show/49854337
Take out the automatic adding of MwInteractives
TODO note about refactoring controller spec
Use periods instead of colons after question numbers.

[#49854337]

https://www.pivotaltracker.com/story/show/49854337
Enforce singular answers for MC in summary

I wasn't able to duplicate [#49081933], so I'm not at all sure what's causing it, but in the event that there are multiple answers recorded for a multiple-choice question without multi-answer checked, only the last one will be shown.

https://www.pivotaltracker.com/story/show/49081933
View spec for activity summary (and a bug fix it revealed)
Obsolete file
Form for adding interactives in page edit mode

[#48924359] Replaces the links with a class-select menu and create button.

https://www.pivotaltracker.com/story/show/48924359
Spec for adding interactives via form
Scaffold and model definition for Sequences

[#51592849] Just the basic Rails scaffold, but the model definition exists and the join model associating sequences and activities is also set up.

https://www.pivotaltracker.com/story/show/51592849
Controller actions and access control for sequences

[#51592849]

https://www.pivotaltracker.com/story/show/51592849
Sequences have owners

https://www.pivotaltracker.com/story/show/51592849
Adds thumbnail_url to activities [#51592849]

https://www.pivotaltracker.com/story/show/51592849
Make view specs work for sequences
HAMLizing ERb views
Adding login/logout partial to activities/edit
Whitespace cleanup
HTML for Sequence views [#51592849]

This gets all the content on the page. In the case of the index page, where the style is borrowed from the Activities listing, it's pretty close to "finished". The new and edit forms aren't bad but don't account for adding and removing activities (yet). The actual show page puts all the content on but is close to unstyled.

https://www.pivotaltracker.com/story/show/51592849