fixed webapp integration tests, and refactored so easier to run just some, and to extend
fix integration tests which break because of locations needing to be managed
add support for jetty6 (quite old, but needed for acunu); also add an AddingEnricher which adds # of 400's with # of 500's to produce # of errors;
minor fixes to other webapp items
Merge pull request #819 from ahgittin/fix/integration-tests

fixes to webapp integration tests
code review comments for #819 and #820
Merge pull request #820 from ahgittin/feature/jetty

jetty appserver
minor tidies for cassandra
suppress membership-change notifications on unchanged service-up events (removes quite a bit of unnecessary processing and logging) and toString for better logging
tidies for api convenience around enrichers and sensor/feeds, and better logging (esp around location problems)
allow a grace period for sensors logging at WARN level if we haven't received any successful responses yet
Merge pull request #821 from ahgittin/fix/misc3

api conveniences, cassandra tidies, and logging fixes
use a concurrent map for membership-tracking service-up cache