The current version of IntelliJ, 13.1.2, only supports Gradle-integration up to version 1.10. Configure this version of Gradle as your project's gradle home.
Now start by creating a build.gradle
file in your project root.
If you try to run the gradle build in IntelliJ now you will get the message: "Error running build: Module 'your-plugin' is not backed by gradle". Close and reopen your project.
You will now have the option to import your project.
Viola!