(SHIFT) Add flavor for SHIFT branding

Change-Id: I2fbc14aa3e69dc6189151e35d4c1996817b638e3
Signed-off-by: Alexander Martinz <amartinz@shiftphones.com>
diff --git a/app/.gitignore b/app/.gitignore
index 796b96d..b46c75a 100644
--- a/app/.gitignore
+++ b/app/.gitignore
@@ -1 +1,3 @@
 /build
+/release
+/shift/release