Upgrade to Maven Checkstyle pluging 2.16

** Bug
    * [MCHECKSTYLE-271] - checkstyle plugin fails with default ruleset and checkstyle 6.2
    * [MCHECKSTYLE-295] - Test resources are not included

** Improvement
    * [MCHECKSTYLE-272] - Upgrade to Checkstyle 6.2
    * [MCHECKSTYLE-284] - Remove config/sun_checks.xml and use the one built into Checkstyle 6.2+
    * [MCHECKSTYLE-290] - add a history table to show which version of Chesktyle is used by default in which version of m-checkstyle-p

** Task
    * [MCHECKSTYLE-278] - Require Java 7
    * [MCHECKSTYLE-285] - Remove config/maven_checks.xml by removing the dependency on maven-shared-resources:2

** Wish
    * [MCHECKSTYLE-268] - Add flag/option to use built-in Google style