keyword argument support, removed last traces of std::function<> usage
diff --git a/example/example7.cpp b/example/example7.cpp
index 82ab3b6..b68b553 100644
--- a/example/example7.cpp
+++ b/example/example7.cpp
@@ -1,5 +1,5 @@
 /*
-    example/example7.cpp -- Example 7: supporting Pythons' buffer protocol
+    example/example7.cpp -- supporting Pythons' buffer protocol
 
     Copyright (c) 2015 Wenzel Jakob <wenzel@inf.ethz.ch>