build: use annotationProcessor for the dagger compiler.

Clover/app/build.gradle

@@ -152,5 +152,5 @@ dependencies {
     // compiling, so our builds become way slower, and I rather have faster builds.
     // Move to gradle 2 when incremental compiling supports annotation processors.
     compile 'com.squareup.dagger:dagger:1.2.5'
-    provided 'com.squareup.dagger:dagger-compiler:1.2.5'
+    annotationProcessor 'com.squareup.dagger:dagger-compiler:1.2.5'
 }