Scala Plugin for IntelliJ IDEA
Link about general plugin development is here<http://confluence.jetbrains.net/display/IDEADEV/PluginDevelopment>
Link about how to setup Scala plugin project in IntelliJ IDEA is here<http://confluence.jetbrains.net/display/SCA/Setting+up+Scala+plugin+project+in+IntelliJ+IDEA>