Jsonmanipulator

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* Split ``core`` module to separate files, which resulted in a better readable code.

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* Used try/except in ``tests`` instead of ``sys.exit(0)`` in ``core`` module.
* The package is now easy-to-use in Python terminal (the programme will not be aborted).

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* Resolved date misprint in HISTORY.rst.
* Created more advanced structure for requirements.
* Made requirements for installations the package more rigorous.
* Deployed EditorConfig for better code consistency.
* Added Makefile in the root directory.
* Made use of the pyup bot (checks dependencies).

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* Created more tests which resulted in code coverage of 97.3%.
* Minor optimization of the core module.

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* Added Pytests.
* Added documentation (using sphinx-documentation).
* Added Tox support.
* Tested code coverage - 92%.
* Enabled Travis CI.
* Resolved 1 bug with the deletion of one book.
* Optimized ``cap_sentence()``, making it non-static.
* Shortened the relevant lines of code by applying the knowledge of the copy function.
* Deployed ``__slots__``, saving RAM when using the package.

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* Made more out-of-the-box functionality of the package.
* Minor optimization of the core module.