build: remove idea gradle plugin (#1354)
build: remove idea gradle plugin (#1354)

The idea gradle plugin is no longer needed since the Idea IDE has better
 support for directly importing a gradle build file.
 e.g. when using the gradle idea task, the resulting project doesn't
 have the gradle view.

 And having the cleanIdea task introduces a small risk when it is
 invoked by mistake. This will delete all personalization to a project.
reallocf/azkaban,reallocf/azkaban,sunghyuk/azkaban,jackrjli/azkaban,HappyRay/azkaban,jackrjli/azkaban,azkaban/azkaban,erwa/azkaban,HappyRay/azkaban,erwa/azkaban,chengren311/azkaban,azkaban/azkaban,azkaban/azkaban,HappyRay/azkaban,sunghyuk/azkaban,sunghyuk/azkaban,reallocf/azkaban,chengren311/azkaban,HappyRay/azkaban,chengren311/azkaban,chengren311/azkaban,erwa/azkaban,azkaban/azkaban,erwa/azkaban,jackrjli/azkaban,reallocf/azkaban,azkaban/azkaban,HappyRay/azkaban,azkaban/azkaban,erwa/azkaban,HappyRay/azkaban,jackrjli/azkaban,sunghyuk/azkaban,chengren311/azkaban,sunghyuk/azkaban,reallocf/azkaban,jackrjli/azkaban