Add more metrics, remove excessive log messages.

Add metrics for deletes and oversized payloads.
Remove overly verbose logging (used for testing hbase retry).
Add testing for the other 'store' method.
Make the retry count and sleep duration settable

Testing with a 30-second timeout was too slow.  Made the timeout
configurable to facilitate faster testing.
Shorten the hbase retry timeout to 1 second.
Add a snippet to pom.xml to make Eclipse happy.

The additions should not affect the maven build, but are required
by eclipse to avoid a warning / build error.
Some cleanup per Anurag's review
Log the final error if we fail all our retries.
Merge pull request #11 from mozilla-metrics/more_metrics_less_logs

More metrics less logs