PEP-8 fixes. Ignore tests without s3fs available. Use ensure_clean

Author: Kevin Kuhl

pandas/io/common.py

@@ -194,7 +194,6 @@ def get_filepath_or_buffer(filepath_or_buffer, encoding=None,
     """
     filepath_or_buffer = _stringify_path(filepath_or_buffer)
 
-    from io import TextIOWrapper
     if _is_url(filepath_or_buffer):
         req = _urlopen(filepath_or_buffer)
         content_encoding = req.headers.get('Content-Encoding', None)
@@ -207,8 +206,8 @@ def get_filepath_or_buffer(filepath_or_buffer, encoding=None,
     if _is_s3_url(filepath_or_buffer):
         from pandas.io import s3
         return s3.get_filepath_or_buffer(filepath_or_buffer,
-                                        encoding=encoding,
-                                        compression=compression)
+                                         encoding=encoding, 
+                                         compression=compression)
 
     if isinstance(filepath_or_buffer, (compat.string_types,
                                        compat.binary_type,