add metrics for ExecutorService and ThreadFactory
'wrappee' sounds silly, renaming
add javadocs for java.util.concurrent instrumentations
implement ExecutionService instead of inheriting from AbstractExecutionService
rename underlying implementations as 'delegate'
use MetricRegistry#name instead of doing concatenation manually
use a Meter for completed tasks
make Metric members private and retrieve them from the registry for testing
format to adhere to project code convention
mark fields as final, removed a stdout statement
use meters for 'created' and 'finished'/'terminated' metrics
have both test classes terminate the generated threads cleanly
add link to metrics-guice
Merge pull request #419 from marshallpierce/metrics-guice-link

add link to metrics-guice
Update contributors.rst

Fixed link to wrong github account
Merge pull request #422 from gseitz/patch-1

Fixed link to wrong github account in contributors.rst
Added metrics-scala.
Merge pull request #423 from erikvanoosten/master

Added metrics-scala as 3rd party.
Fix servlet docs.

Closes #424.
avoid NullPointerException when second argument to name function of MetricRegistry class is null