Upgrade to Kotlin 1.1.3

This commit also enables Kotlin build with JDK 9 since this new
version supports it.

build.gradle

@@ -1,5 +1,5 @@
 buildscript {
-	ext.kotlinVersion = '1.1.2-5'
+	ext.kotlinVersion = '1.1.3'
 	repositories {
 		maven { url "https://repo.spring.io/plugins-release" }
 	}
@@ -109,7 +109,6 @@ configure(allprojects) { project ->
 	apply from: "${gradleScriptDir}/ide.gradle"
 	apply from: "${gradleScriptDir}/sniffer.gradle"
 
-	if(!JavaVersion.current().java9Compatible) {
 	apply plugin: "kotlin"
 	compileKotlin {
 		kotlinOptions.jvmTarget = "1.8"
@@ -120,7 +119,6 @@ configure(allprojects) { project ->
 		kotlinOptions.jvmTarget = "1.8"
 		kotlinOptions.freeCompilerArgs = ["-Xskip-runtime-version-check"]
 	}
-	}
 
 	configurations.all {
 		// Check for updates every build