Correct gen series str (#592)

* parallel and add mask for methods: capitalize, casefold, swapcase, title

* correct master

* correct gen series.str

* fix problem with PEP8

* change

* change

* change

Author: Rubtsowa

sdc/tests/tests_perf/test_perf_series_str.py

@@ -57,7 +57,7 @@ def setUpClass(cls):
         cls.width = [16, 64, 512, 1024]
 
     def _test_case(self, pyfunc, name, total_data_length, data_num=1, input_data=test_global_input_data_float64):
-        test_name = 'Series.{}'.format(name)
+        test_name = 'Series.str.{}'.format(name)
 
         input_data = input_data or test_global_input_data_unicode_kind4