Fixes depreciated Couchbase REST API URI (couchbase 3.0).
small change in comments
* Keep depreciated URI as a rescue
Add support for jmxfetch0.4

Support for attach api
Fix thread leak when exceeding the metrics limit
Merge pull request #1209 from DataDog/yann/couchbase-3

Fixes depreciated Couchbase REST API URI (couchbase 3.0).
Upgrade to latest build of jmxfetch
Merge branch 'master' into isaac/supervisord_check

* master:
  Upgrade to latest build of jmxfetch
  Add support for jmxfetch0.4
  * Keep depreciated URI as a rescue
  small change in comments
  Fixes depreciated Couchbase REST API URI (couchbase 3.0).