Added Sip and PyQt to includes

This should make it possible to distribute a DMG file.

src/build_osx.py

@@ -5,12 +5,15 @@ version = "0.3.4"
 mainscript = ["bitmessagemain.py"]
 
 setup(
-     name = name,
+	name = name,
 	version = version,
 	app = mainscript,
 	setup_requires = ["py2app"],
-	options = dict(py2app=dict(
-		resources = ["images"],
-		iconfile = "images/bitmessage.icns"
-    ))
+	options = dict(
+		py2app = dict(
+			resources = ["images"],
+			includes = ['sip', 'PyQt4._qt'],
+			iconfile = "images/bitmessage.icns"
+		)
+	)
 )