Alter Cormode paper link
Make documentation link to Cormode paper
Add CORS Access-Control header.

Have the MetricsServlet send back the Access-Control-Allow-Origin header
so that the JSON output from the metrics servlet can be used in browser
based dashboards separate from the application.
Fix Gauge javadoc

The gauge docs incorrectly list value instead of getValue
Add test for Meter EWMAs approximation
make sure that EWMA intervals are adjacent
Merge pull request #442 from jmslagle/patch-1

Fix Gauge javadoc
Merge pull request #439 from ceetav/low_rates_ewma

Meter: EWMA deviates for low rates from the actual rate
Merge pull request #437 from GregBowyer/master

Update link for a none 404 Cormode paper
Add charset option for Graphite client.

Fixes #441.
Allow CORS origin to be configured.

If left unset, CORS headers are disabled.
Merge pull request #440 from wotifgroup/cross-origin

Add CORS Access-Control header.
Upgrade to Jetty 9.0.4.
Upgrade servlet tests to Jetty 9.
Updated relnotes.
Update contributors.
Split out context listeners.

AdminServletContextListener is now deprecated.
Fix MetricsServletTest.
Manually merge upstream into pullrequest 438