Saving & Loading of interactive JSON is now reliable.  [#63474246]

https://www.pivotaltracker.com/story/show/63474246
Saving & Loading of interactive happens on page load & exit [#63474246]

https://www.pivotaltracker.com/story/show/63474246
iframe-saver.coffee: readability, 42s auto-saving, conditional JS in view

* Added some comments to the CoffeeScript, and made the code more readable
* Implemented 42 send auto-saving
* Only make the iFrame saver if the author has specified.

[#63474246]

https://www.pivotaltracker.com/story/show/63474246
Extract save-indicator.coffee from save-on-change.coffee

[#63474246]

https://www.pivotaltracker.com/story/show/63474246
Only Navigate away if the HREF location has been set.

This prevents delayed navigation if the a# that was clicked didn’t have a
href url

[#63474246]

https://www.pivotaltracker.com/story/show/63474246
Remove manual load and save buttons.
Add spec test for interactive_run_state.rb
Fix failing Jasmine tests. TODO: mock collaborators in this test.
iframe-saver.coffee — first attempt at some Jasmine tests.