Specs for adding/removing activities from sequences
Now I know how to do this (force an update error)
Make the sequence description text area WYSIWYG
Smooths out show page display
Quick cut at show styling for sequence page

For [#51592849], I'm reluctant to get too deep in the styling with a new skin coming, so this is just a rough cut.

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