Combine DeclaredName and UsageName linters

It was mentioned in #75 that there was some confusion around when
`DeclaredName` would report a lint versus `UsageName`. Since these
checks go hand-in-hand, combine them.

Change-Id: Ic5574aeb1a7349ffdeafd0a4b865704126437e08
Reviewed-on: https://gerrit.causes.com/33671
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane@causes.com>