Hook up instrumentation service config, instrument helper method
Instrument some simple searches

Not definite on the event names and payloads here. Just getting this going.
Pass instrumentation_service to Net::LDAP
Merge branch 'master' into instrumentation

Conflicts:
	lib/github/ldap.rb
Merge branch 'instrumentation-service-support' into instrumentation
Extract instrumentation plumbing
Merge branch 'master' into instrumentation

Conflicts:
	lib/github/ldap.rb
Instrumentation is a module
Remove inner instrument call, wrap everything in outer instrument
Add MockInstrumentationService for tests
Use idiomatic event naming, test search instrumentation
Remove group instrumentation call

Covered by the chokepoint (search) instrumentation.
Ensure payload is distinct from what's passed in

This is because we modify what comes in (with, at the very least,
:result).
Merge pull request #29 from github/instrumentation

Instrument queries