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kotlinlang

Using the interface `HasConvention` seems ugly given that there's a javadoc on it that says that its not going to stick around:
<https://github.com/JLLeitschuh/ktlint-gradle/blob/master/src/main/kotlin/org/jlleitschuh/gradle/ktlint/KtLintPlugin.kt#L37-L40>

However, the GSK build uses the same thing;
<https://github.com/gradle/gradle-script-kotlin/blob/master/build.gradle.kts#L115-L117>

I'm assuming if there was a better way you'd be doing it. Is there a way that plugins are supposed to consume the kotlin plugin's source set?
```
/**
 * Demarcates objects that expose a convention.
 *
 * Convention objects aren't going to be around forever, so this is a temporary interface.
 */
public interface HasConvention {
```

jlleitschuh: yeah, I’m not very happy about it but it seems to be the way for now. We should hide it behind a utility function though

Wouldn't it be better if it were under something like `KotlinConvention` much like there is `JavaConvention`?