Update build to use maven release plugin

[mattrpav]

Add sonatype oss staging plugin too..

<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-release-plugin</artifactId>
  <configuration>
    <pushChanges>true</pushChanges>
    <localCheckout>true</localCheckout>
    <tagNameFormat>v@{project.version}</tagNameFormat>
    <autoVersionSubmodules>true</autoVersionSubmodules>
    <goals>clean package deploy</goals>
  </configuration>
</plugin>