Allow publishing data to a directory with trailing slash.

Closes #51 (closed) by splitting the file path again if the second part is an empty string. This occurs if the given path has a trailing slash.

plotid/example.py

@@ -56,5 +56,5 @@ IMGS_AS_LIST = [IMG1, IMG2]
 # plots or images.
 
 publish(['../README.md', '../docs', '../LICENSE'],
-        '/home/chief/Dokumente/fst/plotid_python/data',
+        '/home/chief/Dokumente/fst/plotid_python/data/',
         TAGGED_FIGS, 'Bild')