Update intellij-idea-ce13 version to 13.1.6

Latest version is 13.1.6
http://confluence.jetbrains.com/display/IntelliJIDEA/Previous+IntelliJ+IDEA+Releases
This should also be updated. In this case, to `862b8b4b8474f88e9df930185b035c65b54e71125796f591dea28cff7db929eb`.