Create a preferences page accessible directly by url

The only preference so far is diverting production analytics.
Use trackLiveAnalytics, not trackAnalytics, for clarity

Users are not turning off analytics completely, just sending them to
the sandbox rather than production analytics project on segment.io.
This helps make that more clear.
Track book downloads in analytics
Maintain book list page when navigating to other screens
Merge pull request #163 from andrew-polk/feature/trackDownloads

Track book downloads in analytics
Merge pull request #161 from andrew-polk/feature/prefsPage

Create a preferences page accessible directly by url
Close Preview and remain on detail when back selected
Use a parameter in the url rather than stop the page change
Add comments on why this code is necessary and what it does
Merge pull request #164 from andrew-polk/feature/savePagination

Maintain book list page when navigating to other screens
Add end quotation mark for customer quote on landing page
Merge pull request #165 from andrew-polk/feature/addEndQuote

Add end quotation mark for customer quote on landing page
Merge pull request #160 from andrew-polk/feature/previewBack

Close Preview and remain on detail when back selected