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.