Set version to rc1 and also update kotlin version

This CL also adds a bintray plugin to easily upload artifacts to bintray.
The plugin is a separate project (because main project depends on it) so
I've committed it as a prebuilt since it is unlikely to change.

Change-Id: I801b334e40bfb49a18bf7190e5100e0910a606a2
diff --git a/compilerCommon/build.gradle b/compilerCommon/build.gradle
index bc59c72..4a5577c 100644
--- a/compilerCommon/build.gradle
+++ b/compilerCommon/build.gradle
@@ -15,7 +15,7 @@
  */
 
 apply plugin: 'java'
-
+apply plugin: 'com.android.databinding.bintray'
 
 sourceCompatibility = config.javaTargetCompatibility
 targetCompatibility = config.javaSourceCompatibility