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**New features**
- Added support for Python 2.7.
- Added support for ``ujson`` library.
- Added ability to preserve comments.
**Improvements**
- New faster ``bmrblex.py`` lexical analyzer module based on Python generators.
- Added Cythonized version of ``bmrblex`` (``cbmrblex.pyx``) for faster tokenization.
- API change: new ``nmrstarlib.read_files()`` generator that does not require passing list.
- API change: new ``StarFile.chem_shifts_by_residue()`` representation.
- Improved printing layout for original NMR-STAR format when printing from ``StarFile`` object.
- Added automated tests for ``pytest`` framework.