WIP: Updates to configuration settings

Updates based on a recent 2.0 devrel build from Riak 2.0 branch.
Changes from first review. Modify multi-backend section to clarify that `$name` can be whatever you want.
Merge branch '2.0.0' into lrb-config-review

Conflicts:
	source/languages/en/riak/ops/advanced/configs/configuration-files.md
Merge pull request #1227 from basho/lrb-config-review

WIP: Updates to configuration settings