POM Modernization

- Corrected maven xsd
- Removed duplication in child poms (url, license, version, groupId)
- Removed commented out scala items
- Removed commented out jetty servlet api
- Removed excess spacing
- Note JavaSE-1.6 & 1.6 oracle docs
- Replaced examples use of antrun with maven-dependency-plugin
- Updated plugin versions
- Added plugins in parent pluginManagement
- Updated mockito & log4j
- Dropped old slf4j-api 1.5.10 - pom pulls latest
- Moved modelVersion to correct location
- Explicit groupId everywhere
- Use maven properties for jdk version used for compiler plugin
- Added generation of test source & javadoc jars