Fixup auto-deselect of people cells
Cleanup minor sample app debris
Fixup auto-scroll of new pages

Ensure we scroll to the top of the page
(collection view section).
Only show delete UI as needed for cleaner UX

Deleting in the context of a nation's list of
people isn't as important.
Merge pull request #14 from 3dna/peng/cleanup-3

Cleanup #3

Add minor fixes and refinements to the sample app
for improved pagination and navigation experience.
Also overhaul the deletion experience to fit the
context more, showing only as needed.