Fixes #67: mvn versions:update-properties versions:use-latest-releases (maven-assembly-plugin, surefire, plexus-component*)

Updated ${maven-assembly-plugin.version} from 2.4.1 to 2.5
Updated ${maven-surefire-plugin.version} from 2.17 to 2.18
Updated ${plexus-component-metadata.version} from 1.5.6 to 1.6
Updated ${maven-failsafe-plugin.version} from 2.17 to 2.18
Updated org.codehaus.plexus:plexus-utils:jar:3.0.19 to version 3.0.20
Updated org.codehaus.plexus:plexus-component-annotations:jar:1.5.6 to version 1.6