Pydash

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- Fix Python 3.5, inspect, and pytest compatibility issue with ``py_`` chaining object when doctest run on ``pydash.__init__.py``.

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- Optimize callback system for performance.

- Explicitly store arg count on callback for ``pydash`` generated callbacks where the arg count is known. This avoids the costly ``inspect.getargspec`` call.
- Eliminate usage of costly ``guess_builtin_argcount`` which parsed docstrings, and instead only ever pass a single argument to a builtin callback function.

- Optimize ``get``/``set`` so that regex parsing is only done when special characters are contained in the path key whereas before, all string paths were parsed.
- Optimize ``is_builtin`` by checking for ``BuiltinFunctionType`` instance and then using ``dict`` look up table instead of a ``list`` look up.
- Optimize ``is_match`` by replacing call to ``has`` with a ``try/except`` block.
- Optimize ``push``/``append`` by using a native loop instead of callback mapping.

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- Add ``ceil``.
- Add ``defaults_deep``.
- Add ``floor``.
- Add ``get``.
- Add ``gt``.
- Add ``gte``.
- Add ``is_iterable``.
- Add ``lt``.
- Add ``lte``.
- Add ``map_keys``.
- Add ``method``.
- Add ``method_of``.
- Add ``mod_args``.
- Add ``set_``.
- Add ``unzip_with``.
- Add ``zip_with``.
- Make ``add`` support adding two numbers if passed in positionally.
- Make ``get`` main definition and ``get_path`` its alias.
- Make ``set_`` main definition and ``deep_set`` its alias.

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- Catch ``AttributeError`` in ``helpers.get_item`` and return default value if set.

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- Fix bug in ``reduce_right`` where collection was not reversed correctly.

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- Add ``sort_by_order`` as alias of ``sort_by_all``.
- Fix ``is_match`` to not compare ``obj`` and ``source`` types using ``type`` and instead use ``isinstance`` comparisons exclusively.
- Make ``sort_by_all`` accept an ``orders`` argument for specifying the sort order of each key via boolean ``True`` (for ascending) and ``False`` (for descending).
- Make ``words`` accept a ``pattern`` argument to override the default regex used for splitting words.
- Make ``words`` handle single character words better.