Ensured that Gradle's build/ directory is ignored by Git.
Configured the PMD plugin for Gradle.

See: http://www.gradle.org/docs/current/userguide/pmd_plugin.html
Renamed the Checkstyle configuration file.
Configured the FindBugs plugin for Gradle.

See: http://www.gradle.org/docs/current/userguide/findbugs_plugin.html
Configured the CodeNarc plugin for Gradle.

See: http://www.gradle.org/docs/current/userguide/codenarc_plugin.html