* fix error in setup.py

* remove pyscaffold template

* add :code:`is_gzip` for all read related method

add `format_time`

add `get_jsonline_chunk_lazy` and :`get_jsonline_chunk`

* Make methods available by :code:`import pysenal`

* Fix check logic in :code:`index`

================
* Fix bug in :code:`json_serialize`

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New Features
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* add :code:`serialize_method` in jsonline write methods
* add :code:`json_serialize` method to help json dumps

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* add one utils method
    * :code:`index`