Minor: add a missing dependency on stdlib-jre8 to the :client:jfx module which was causing IntelliJ to cry.

client/jfx/build.gradle

@@ -36,6 +36,7 @@ dependencies {
     compile project(':finance')
     compile project(':client:rpc')
 
+    compile "org.jetbrains.kotlin:kotlin-stdlib-jre8:$kotlin_version"
     compile "com.google.guava:guava:$guava_version"
 
     // ReactFX: Functional reactive UI programming.