Ignore vim swap files

Makes the life of vim users simpler.

Change-Id: I62da9821be8b619fe3fc41d4eeb6286d3ec88e1c
diff --git a/.gitignore b/.gitignore
index c8d2560..83c5419 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 proto
 *~
+.*.sw[nop]
 *.log
 src
 localrc