Merge pull request #44 from onionhammer/patch-1

functional.h not included in "make install"

CMakeLists.txt

@@ -74,6 +74,7 @@ set(PYBIND11_HEADERS
   include/pybind11/numpy.h
   include/pybind11/numpy.h
   include/pybind11/complex.h
   include/pybind11/complex.h
   include/pybind11/stl.h
   include/pybind11/stl.h
+  include/pybind11/functional.h
 )
 )
 
 
 # Create the binding library
 # Create the binding library