Add the ability to share registries by name.

Closes #334.
Make metrics-log4j configurable by XML.

Closes #369.
Make metrics-logback configurable via XML.

Closes #368.
Make metrics-ehcache configurable by XML.

Closes #358.
Add a context listener to metrics-servlet.

Closes #360.
Make InstrumentedResourceMethodDispatchAdapter configurable via XML.

Closes #359.
fixing parentheses mismatch in the getting started guide.
Corrects servlets package name (c.c.m.servlets, not c.c.m.servlet)
documentation correction: MetricRegistry, not MetricsRegistry.
Merge pull request #407 from futures/fcrepo-snapshot

Corrects servlets package name (c.c.m.servlets, not c.c.m.servlet)
Merge pull request #406 from pcsanwald/master

Fixing small typo in getting started guide
InstrumentedHandler: Remove duplicate calls to activeRequests.dec().

The counter is decremented inside updateResponses(). This caused the
active-requests counter to be negative.
Adding an example ServletContextListener to servlets, for use in a web.xml or similar.
adding a unit test and fixing a small typo in the docs.
Merge pull request #408 from evanj/master

InstrumentedHandler: Remove duplicate calls to activeRequests.dec()
Merge remote-tracking branch 'upstream/master'

Conflicts:
	docs/source/manual/servlets.rst
Fix p99s in Slf4jReporter.
Merge pull request #409 from pcsanwald/master

Example ServletContextListener
Don't use statics.