Fixing .gitignore to omit some transient test files.

Change-Id: I2bb2cd091a5dd7acbb3cc496f8d2ded20e6c6d0b
diff --git a/.gitignore b/.gitignore
index 71e25dd..0eba486 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,3 +14,4 @@
 *.DS_Store
 
 core/store/trivial/data/
+core/store/apps