Remove NIO integration module

Fixes Kotlin#601

Author: elizarov

binary-compatibility-validator/build.gradle

@@ -20,7 +20,6 @@ dependencies {
 
     testArtifacts project(':kotlinx-coroutines-guava')
     testArtifacts project(':kotlinx-coroutines-jdk8')
-    testArtifacts project(':kotlinx-coroutines-nio')
     testArtifacts project(':kotlinx-coroutines-quasar')
     testArtifacts project(':kotlinx-coroutines-slf4j')
 

binary-compatibility-validator/reference-public-api/kotlinx-coroutines-nio.txt

@@ -6,7 +6,6 @@ Module name below corresponds to the artifact name in Maven/Gradle.
 ## Modules
 
 * [kotlinx-coroutines-jdk8](kotlinx-coroutines-jdk8/README.md) -- integration with JDK8 `CompletableFuture` (Android API level 24).
-* [kotlinx-coroutines-nio](kotlinx-coroutines-nio/README.md) -- integration with asynchronous IO on JDK7+ (Android O Preview).
 * [kotlinx-coroutines-guava](kotlinx-coroutines-guava/README.md) -- integration with Guava [ListenableFuture](https://github.com/google/guava/wiki/ListenableFutureExplained).
 * [kotlinx-coroutines-quasar](kotlinx-coroutines-quasar/README.md) -- integration with [Quasar](http://docs.paralleluniverse.co/quasar/).
 * [kotlinx-coroutines-slf4j](kotlinx-coroutines-slf4j/README.md) -- integration with SLF4J [MDC](https://logback.qos.ch/manual/mdc.html).

integration/README.md

@@ -26,7 +26,6 @@ module('core/kotlinx-coroutines-core')
 
 module('integration/kotlinx-coroutines-guava')
 module('integration/kotlinx-coroutines-jdk8')
-module('integration/kotlinx-coroutines-nio')
 module('integration/kotlinx-coroutines-quasar')
 module('integration/kotlinx-coroutines-slf4j')