Fixes data path in read_meta_file

pydtn/shed.py

@@ -49,7 +49,10 @@ def write_meta_file(meta_path, csv_path, duty_cycle_length=300):
 def read_meta_file(meta_path):
     """Return metadata for a data set, from a metadata file."""
     with open(meta_path) as meta_file:
-        return json.load(meta_file)
+        meta = json.load(meta_file)
+        meta['data'] = path.join(path.dirname(meta_path), meta['data'])
+        return meta
+
     raise RuntimeError('Should not get here...')