Update version of gradle plugin (1.0.0-rc4)

Author: johnkil

build.gradle

@@ -4,7 +4,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:1.0.0-rc1'
+        classpath 'com.android.tools.build:gradle:1.0.0-rc4'
     }
 }