Some minor cleanups in dep_spec.
Add new dep counter helpers that use expectations instead of the yield counter hack.
Reimplement the met?/meet counter dep specs using the should_receive counter helpers.
Reimplement deps_spec using the should_receive counter helpers.
Update the 'already met' tree in deps_spec to match the others.
Inline the 'already met?' met? specs in deps_spec.
Check the trees' top-level return values in deps_spec instead of using a separate spec.
Remove old counter dep helpers, which are unused now.
Tweak and reword the dep counting specs.
Merge branch 'refactor-dep-specs'