Fix lint issue related to spoon integration.

Author: vincentbrison

build.gradle

@@ -23,7 +23,12 @@ buildscript {
     dependencies {
         classpath 'com.android.tools.build:gradle:1.2.3'
         classpath 'com.neenbedankt.gradle.plugins:android-apt:1.4'
-        classpath 'com.stanfy.spoon:spoon-gradle-plugin:1.0.2'
+
+        classpath('com.stanfy.spoon:spoon-gradle-plugin:1.0.2') {
+            exclude module: 'guava'
+        }
+        classpath 'com.google.guava:guava:18.0'
+
     }
 }