Handle IOError: [Errno 32] Broken pipe

Will happen if piping through a pager like less, that closes
stdout before everything has been printed.

Related: #47

pubs/pubs

@@ -1,5 +1,19 @@
 #!/usr/bin/env python
 # -*- coding:utf-8 -*-
 
+import sys
+
 from pubs import pubs_cmd
+
+try:
     pubs_cmd.execute()
+except IOError:
+    # stdout or stderr has been closed, cleaning up
+    try:
+        sys.stdout.close()
+    except IOError:
+        pass
+    try:
+        sys.stderr.close()
+    except IOError:
+        pass