fix recommender get_all_rows distribution mode to random (fix #683)
replace map with unordered_map
Make __repr__ function instead of __str__
Merge pull request #686 from jubatus/fix-683

fix recommender get_all_rows distribution mode to random (fix #683)
Merge pull request #694 from jubatus/replace-map

replace map with unordered_map
Set seeds of random values in clustering test case
Merge pull request #702 from jubatus/clustering-test-seed

Set seeds of random values in clustering test case
Merge pull request #696 from jubatus/python-repr

Make `__repr__` method instead of  `__str__`