Updated setup.py so it can build the capstone library by itself.

This is a requirement for an automated install via pip. After this change it
should be possible to depend on captone in pip and have it built automatically.
diff --git a/MANIFEST.in b/MANIFEST.in
new file mode 100644
index 0000000..04f6ccf
--- /dev/null
+++ b/MANIFEST.in
@@ -0,0 +1,4 @@
+recursive-include src *
+recursive-include pyx *
+recursive-include capstone *
+include README setup.py
\ No newline at end of file