1.0.4

• Update gradle 2.3 -> 2.4
• Update gradle-bintray-plugin 1.1 -> 1.2
• Update gradle-versions-plugin 0.8 -> 0.9
• Remove explicit pmd dependencies because gradle now supports pmd 5.2 and above (not updated to 5.3.1 because of regression https://sourceforge.net/p/pmd/bugs/1331/)
• Update checkstyle 6.4.1 -> 6.5 (not updated to 6.6 because it fails with NPE sometimes)
• Switch gradle-release-plugin from com.github.townsfolk:gradle-release to net.researchgate:gradle-release (old plugin abandoned and this one is the new version)
• Removed checkOutOfDate task: use dependencyUpdates task instead (provided by version plugin)
• Apply correct groups for custom tasks