Upgrade to Dropwizard 0.7.1

Upgrade to Dropwizard 0.7.1.
Upgrade newrelic-api from 3.5.0 to 3.72
Upgrade httpclient from 4.3.3 to 4.3.4
Upgrade metrics-core from 3.0.1 to 3.0.2
Upgrade guava from 16.0.1 to 17.0
Merge pull request #8 from jplock/jp-dw-7.1

Upgrade to Dropwizard 0.7.1