Coverage

Add scripts for gathering coverage data on target, and analyzing
coverage info on host.

Change-Id: I3bb2d0ec3757ce077638a8780779daa84cd48686
diff --git a/.gitignore b/.gitignore
index 156b7b3..5ac4dcf 100644
--- a/.gitignore
+++ b/.gitignore
@@ -17,3 +17,5 @@
 #
 
 /build
+*.gcda
+*.gcno