use quotes for project headers

Signed-off-by: Patrick Venture <venture@google.com>
Change-Id: I2471dae46ddd54b6e3e118ac75e73015928e00d5
diff --git a/src/EntityManager.cpp b/src/EntityManager.cpp
index 17eeade..2f70483 100644
--- a/src/EntityManager.cpp
+++ b/src/EntityManager.cpp
@@ -16,10 +16,10 @@
 
 #include "EntityManager.hpp"
 
+#include "Overlay.hpp"
+#include "Utils.hpp"
 #include "VariantVisitors.hpp"
 
-#include <Overlay.hpp>
-#include <Utils.hpp>
 #include <boost/algorithm/string/case_conv.hpp>
 #include <boost/algorithm/string/classification.hpp>
 #include <boost/algorithm/string/predicate.hpp>