add LatchedStatsListener.
make admin-port stats always be latched
none of these libraries are used
move index.html to a more secret place to workaround a birdcage bug
namespace is meaningless with a cached latched period
make it concurrent
review comments
move a sync block back to the class it belongs in.
errant file. begone.
Merge branch 'race'
add changelog entry
Merge branch 'master' into latch
review feedback: just make these volatile, immutable, and remove the lock.
Merge branch 'latch'
bump to 4.6.0 and add changelog
org=com.twitter,name=ostrich,version=4.6.0
org=com.twitter,name=ostrich,version=4.6.1-SNAPSHOT
Remove unnecessary synchronizations
Add equality test.
Implement tests that illustrate bug in StatsListener creation.

The StatsListener object does not properly return the same LatchedStatsListener for the same interval.