Error thrown when eclipse plugin applied before gwt plugin

[strootman]

I tested this on master (486087b).
From a fresh clone, I ran gradlew publish. No problems.

Then I went into the war-using-library sample project's build.gradle file, moving the apply plugin: 'eclipse' line before the gwt plugin apply.
After executing a gradlew tasks, I receive the following error:

> Cannot add extension with name 'gwt', as there is an extension already registered with that name.

This seems to only happen with the eclipse plugin, because I tried unsuccessfully to reproduce this error with the war plugin.

I didn't see anything obvious in the code, but I plan to dive a little deeper later on.

[steffenschaefer]

Thank you for the bug report :)
Should be fixed on master. This was due to a circular dependency of two plugins. As the GwtEclipsePlugin wasn't ever intended to be directly used (it was only introduced for separating the Eclipse related stuff from the other stuff) it isn't a real plugin anymore.

[strootman]

I pulled the changes and tested on master. Looks good!