Install nginx paths inside /embedded.

This hopefully makes it more clear what config files are from install vs
run time.
Add installation for static site project. Bump ruby bundler version.
Bump redis to 2.8.14.
Bump nginx library dependencies.
Let's try using ngx_txid for unique request ids.

The idea is that these IDs are sortable and better suited for use as
elasticsearch's ID.
Various updates to get building again.