Upgrade to Jackson 2.x

Sitebricks had previously been using Jackson 1.9.x (from the org.codehaus package), but that version has become the legacy version of Jackson. Instead, Sitebricks should be using the newer Jackson 2.x 9 (from the com.fasterxml package). Changes in this pull request include updating the POM files with the newer Jackson version and making changes in the import statements inside the source code.