Load more at startup to better share with workers

A few tweaks at startup in order to use less memory and have faster
worker boot time.

* Preload locales
* Load the first of each table (and thus the schema) in the database
* Warm the rails router
* Run GC before forking
Merge pull request #11 from freerunningtech/gotta_go_fast

Load more at startup to better share memory with workers