Add JSON files and oauth storage to .gitignore.

The only JSON file is the client secret file, which we really don't
want leaking. Same goes for the oauth storage file.

Change-Id: Ie860704574ec37ccfc50ff7c9d59717a7b9b443b
diff --git a/tools/bionicbb/.gitignore b/tools/bionicbb/.gitignore
index 76ff599..d0ff064 100644
--- a/tools/bionicbb/.gitignore
+++ b/tools/bionicbb/.gitignore
@@ -1,4 +1,6 @@
 config.py
+*.json
+oauth.storage
 
 # Byte-compiled / optimized / DLL files
 __pycache__/