Remove IDE plugins from build script.

Gradle importers built into IDEA and Eclipse can import the project regardless.
Remove Ivy publishing.

Ivy users wanting to publish locally can use `./gradlew install` to install to the local M2 repo and use it from there.
Remove unnecessary POM elements.

These are filled out automatically.
Remove unnecessary descriptions.
Ensure that POM generated for local install and final publish are the same.

It's unfortunate that this is what it takes, but it is what it takes.
whitespace.