browser tab title selection delegated to lineup

remove dependence on page json in the dom.
refer to title as bestTitle, implying there are choices.
action handler finds slug via lineup

this removes a dependence on having json in the dom.
this still depends on having a lineup key in the dom.
oops, missing lineup logic from previous commit
show json we find in lineup based on key in dom
use lineup in tests for inspecting generated pages
use lineup for forking to/from local storage

this removes a dependency on having json in the dom.
revise dependency graphs
Merge pull request #41 from fedwiki/ward/page

Preparing to remove page json from the dom.