Dokka fixes

  * Provide module with Kotlin 1.3 API because Kotlin 1.2 from Dokka can't read classes marked as "from the future"
  * Add runConfiguration dokkaStubs which is included only during dokka task with some classpath magic for Kotlin 1.3
  * Add package.list for slf4j
  * Fix unresolved types/links in documentation
  * Suppress all internal/inherited API
diff --git a/docs/channels.md b/docs/channels.md
index e216b8d..d213688 100644
--- a/docs/channels.md
+++ b/docs/channels.md
@@ -627,6 +627,7 @@
 <!--- INDEX kotlinx.coroutines -->
 [CoroutineScope]: https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines/-coroutine-scope/index.html
 [runBlocking]: https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines/run-blocking.html
+[kotlin.coroutines.CoroutineContext.cancelChildren]: https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines/kotlin.coroutines.-coroutine-context/cancel-children.html
 [Dispatchers.Default]: https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines/-dispatchers/-default.html
 <!--- INDEX kotlinx.coroutines.channels -->
 [Channel]: https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines.channels/-channel/index.html