Update gitignore, new commits in caravel submodule

.gitignore

diff --git a/.gitignore b/.gitignore
index b2a927b..2930de0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,5 @@
 precheck_results
 *~
+*.swp
+caravel
+pdk

caravel

diff --git a/caravel b/caravel
index 0f16ba8..42c9cab 160000
--- a/caravel
+++ b/caravel
@@ -1 +1 @@
-Subproject commit 0f16ba8eaae841a6f122fc0d5837005d3312fd2b
+Subproject commit 42c9cab06c7fdd94b7eacc12a5c4ff4a60338e74