Make single report for all subprojects.

Change-Id: Ib396452faf8aea23629c197d3098fd9a452a4570
diff --git a/.gitignore b/.gitignore
index 948d3f9..82c229a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,6 +5,7 @@
 *.class
 *.DS_Store
 .gradle
+/build
 /out
 .idea/workspace.xml
 .idea/dictionaries/tnorbye.xml