some fixes to setup.py for Mac OS X, and .gitignore additions

.gitignore

@@ -1,8 +1,15 @@
 *.pyc
 build
 
+# header files that may be copied over, if missing
+ImPlatform.h
+Imaging.h
+
 # various forms of compiled _composite extensions
 _composite.so
 _composite.pyd
 _composite_d.pyd
 _composite.dylib
+
+# Mac OS X noise
+.DS_Store

setup.py

@@ -32,7 +32,7 @@ if py2exe != None:
 # _composite.c extension
 #
 
-setup_kwargs['ext_modules'].append(Extension('_composite', ['_composite.c']))
+setup_kwargs['ext_modules'].append(Extension('_composite', ['_composite.c'], include_dirs=['.']))
 # tell build_ext to build the extension in-place
 # (NOT in build/)
 setup_kwargs['options']['build_ext'] = {'inplace' : 1}
@@ -48,8 +48,8 @@ class CustomClean(clean):
         # try to remove '_composite.{so,pyd,...}' extension,
         # regardless of the current system's extension name convention
         build_ext = self.get_finalized_command('build_ext')
-        fname = build_ext.get_ext_fullpath('_composite')
-        pretty_fname = os.path.split(fname)[1]
+        pretty_fname = build_ext.get_ext_filename('_composite')
+        fname = pretty_fname
         if os.path.exists(fname):
             try:
                 if not self.dry_run: