Update README with info on versioning and usage
Clean up code/docs style

    * Impose 100 char line-length limit
    * Adjust code/docs to match new line-length
    * Add docs to undocumented public methods
Fix versioning mis-information in README

We should keep the usage example using an actually released version to
ensure people can just copy/paste.
Add exclusion list for metrics from Graphite

You can now configure the `GraphiteReporter` to exclude named metrics by
providing the `excludes` section in the Graphite configuration.

Example:

graphite:
  enabled: true
  prefix: services.example
  excludes:
    - com.example.dao.Person.findPerson
    - com.example.resources.Person.auth.login

The format of the exclusion is: `package.class[.scope].name`. The
`scope` is optional, dependent on whether the metric defines one.
Change scope of HBase metrics to instance name

Every `HBaseClient` has a name, which should be used as the scope of the
metrics for each client. This allows us to prevent metrics for each
instance from clashing.
Bump Dropwizard dependency version to 0.6.2

Preparing to release Dropwizard Extra 0.6.2-1
[maven-release-plugin] prepare release dropwizard-extra-0.6.2-1
[maven-release-plugin] prepare for next development iteration
Update development version to 0.7.0-1-SNAPSHOT

Prepare for removal of upstream `dropwizard-scala` by not depending on
it.
Merge branch 'develop' into feature/gelf-appender

Conflicts:
	pom.xml
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.