corrected the way pybake looks for pybind11

setup.py

 from distutils.core import setup
 from distutils.extension import Extension
 from distutils.sysconfig import get_config_vars
+import pybind11
 import pkgconfig
 import os
 import os.path
 import sys
 
+def get_pybind11_include():
+    path = os.path.dirname(pybind11.__file__)
+    return '/'.join(path.split('/')[0:-4] + ['include'])
+
 (opt,) = get_config_vars('OPT')
 os.environ['OPT'] = " ".join(
 		    flag for flag in opt.split() if flag != '-Wstrict-prototypes'
@@ -24,18 +29,21 @@ client_libraries = pk['libraries']
 client_library_dirs = pk['library_dirs']
 client_include_dirs = pk['include_dirs']
 client_include_dirs.append(".")
+client_include_dirs.append(get_pybind11_include())
 # For server...
 pk = pkgconfig.parse('bake-server')
 server_libraries = pk['libraries']
 server_library_dirs = pk['library_dirs']
 server_include_dirs = pk['include_dirs']
 server_include_dirs.append(".")
+server_include_dirs.append(get_pybind11_include())
 # For target...
 pk = pkgconfig.parse('uuid')
 target_libraries = pk['libraries']
 target_library_dirs = pk['library_dirs']
 target_include_dirs = pk['include_dirs']
 target_include_dirs.append('.')
+target_include_dirs.append(get_pybind11_include())
 pk = pkgconfig.parse('bake-server')
 target_include_dirs.extend(pk['include_dirs'])
 
@@ -62,7 +70,7 @@ pybake_target_module = Extension('_pybaketarget', ["pybake/src/target.cpp"],
                     depends=["pybake/src/target.cpp"])
 
 setup(name='pybake',
-      version='0.1',
+      version='0.2.1',
       author='Matthieu Dorier',
       description="""Python binding for BAKE""",      
       ext_modules=[ pybake_server_module, pybake_client_module, pybake_target_module ],