Skip artifact deployment during deploy phase (uses s3-upload instead).

Prevents the following error when executing `mvn deploy` or `mvn release:perform`:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-deploy-plugin:2.8.2:deploy (default-deploy) on project mapzen: Deployment failed: repository element was not specified in the POM inside distributionManagement element or in -DaltDeploymentRepository=id::layout::url parameter -> [Help 1]
Automatically invokes release profile when cutting a release

* Configures maven-release-plugin to automatically invoke "release" profile when running `mvn release:prepare` or `mvn release:perform`.
* Updates release checklist documentation.