config: don't explicitely eager-load lib/
config: don't explicitely eager-load lib/

Rationale:

- `lib/` is supposed to contain code mostly independant from Rails;
- By default, Rails doesn't eager-load `lib/` anymore (this used to be
the case, but since a few releases).

If this commits triggers some errors, then these errors should be fixed
(rather that `lib/` being added again to the load path).
sgmap/tps,sgmap/tps,sgmap/tps