Updated version of Jenkins, Nexus and Sonar.

Jenkins 1.491 not support SVN 1.7 repositories.

Jenkins: 1.491 to 1.517
Nexus: 2.3 to 2.5.0-04
Sonar: 3.3.2 to 3.5.1
Updated Jenkins plugins.

Updated plugins:
analysis-core
dry
pmd
findbugs
checkstyle
m2release
redmine
sonar