Remove org.sonatype.oss parent from pom.xml

[tushuhei]

org.sonatype.oss depends on the old version of maven-javadoc-plugin, which raises the following error in deployment.

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-javadoc-plugin:2.7:jar (attach-javadocs) on project budoux:
Execution attach-javadocs of goal org.apache.maven.plugins:maven-javadoc-plugin:2.7:jar
failed: Unable to load the mojo 'jar' in the plugin 'org.apache.maven.plugins:maven-javadoc-plugin:2.7' due to an API incompatibility: org.codehaus.plexus.component.repository.exception.ComponentLookupException: null 

This change removes the dependency to org.sonatype.oss and updates the pom.xml to use the updated maven-javadoc-plugin.

[kojiishi]

lgtm

[tushuhei]

superseded by #779