do not package .swp files (fixes #269)

Signed-off-by: Nico Schottelius <nico@bento.schottelius.org>

setup.py

@@ -1,6 +1,7 @@
 from distutils.core import setup
 import cdist
 import os
+import re
 
 def data_finder(data_dir):
     entries = []
@@ -10,6 +11,11 @@ def data_finder(data_dir):
         if name == ".gitignore":
             continue
 
+        # Skip vim swp files
+        swpfile = re.search(r'^\..*\.swp$', name)
+        if swpfile:
+            continue
+
         entry = os.path.join(data_dir, name)
         if os.path.isdir(entry):
             entries.extend(data_finder(entry))