Update README's example to latest stable version
Add GelfLoggingOutput

Permits configurable logging to graylog2 servers.
Improve GELF Appender

Adds maximum chunksize setting, names the Appender and gives it the
correct LoggerContext.
Replaced GELF Appender with custom Appender

No longer depends on a third-party Appender, which cuts out the
transitive dependency on Gson. Instead uses a Jackson `ObjectMapper` to
do the JSON work.
Add test confirming issue #13

When creating a new configured ZooKeeper instance, the attempt to parse
the port out of the generated connection string always fails.
Fix critical issues #13 in dw-ex-curator

The `Matcher` had not been advanced to the first matching instance of
the port in the connection string. This caused it to always fail, even
when a default port was configured, as the connection string *always*
includes the port.

Fixes #13
Clean up configuration of GelfAppender
Update to new 0.7.0 Environment API.
Update compiler to Java 1.7

Upstream Dropwizard has made the jump to Java 7, so we should too.
Switch to com.codahale namespace and metrics 3.0.0

0.7.0 and metrics 3.0.0 are both under the `com.codahale` namespace, not
com.yammer.
Fix everything to work with new 0.7.0 API

Regression:
    * `dropwizard-extra-kafka` - `MessageProcessor` no longer times
    iterations. You will need to do this explicitly in your
    `MessageProcessor` until a new API is devised.
Fix Configuration tests to use Jackson helper

`Jackson.newObjectMapper()` should be used to create `ObjectMappers`
that are configured for use in Dropwizard.
Clean up Classes a little

Don't use the fully-qualified method name when we can get away with it.
Merge branch 'feature/gelf-appender' of github.com:datasift/dropwizard-extra into feature/gelf-appender

Conflicts:
	dropwizard-extra-gelf/src/main/java/com/datasift/dropwizard/logging/gelf/GelfAppender.java
	dropwizard-extra-gelf/src/main/java/com/datasift/dropwizard/logging/gelf/GelfLayout.java
	dropwizard-extra-gelf/src/main/java/com/datasift/dropwizard/logging/gelf/GelfLoggingOutput.java
Merge branch 'develop' into feature/gelf-appender
Upgrade GELF module to 0.7.0-SNAPSHOT

  * `GelfLoggingOutput` renamed to `GelfAppenderFactory`
  * `GelfAppenderFactory` now provides accessor methods.
  * `GelfAppenderFactory` `@JsonProperty` annotations moved to accessor
    methods to allow easier overriding by sub-classes.