Pydash

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- Shallow copy each source in ``assign``/``extend`` instead of deep copying.
- Call ``copy.deepcopy`` in ``merge`` instead of the more resource intensive ``clone_deep``.

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- Fix minor issue in deep path string parsing so that list indexing in paths can be specified as ``foo[0][1].bar`` instead of ``foo.[0].[1].bar``. Both formats are now supported.

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- Fix bug in ``start_case`` where capitalized characters after the first character of a word where mistakenly cast to lower case.

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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.