Add DisplayTitle to Sequence Model.

[#56610720]

https://www.pivotaltracker.com/story/show/56610720
Use NGS style-guide developed by Celerity. Show Sequence Title in logo.

actually uses "display_title" of sequence model.

[#56610720]
https://www.pivotaltracker.com/story/show/56610720
Merge branch 'master' into staging

* master:
  Use NGS style-guide developed by Celerity. Show Sequence Title in logo.
  Add DisplayTitle to Sequence Model.