Added a run_scapy script at the package's root to run scapy without install
diff --git a/MANIFEST.in b/MANIFEST.in
index 953617d..5725f6c 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,2 +1,3 @@
 include MANIFEST.in
+include run_scapy
 include doc/*