Ruikowa : Parse left recursion cases, make static analysis&optimization, support each version in python3.x

To make some optimizations, now

• in some degree, data structure is similar to C++ std::vector. [reuse memory]
• static code analysis.
  • deal with left recursion grammars when compiling to speed up left recursive parsing.
  • remove redundant grammars and merge them if possible.
• non-recur solution about cycle left-recur.

To install it as a Python package, just

python setup.py install

Feel free to use PyPI:

pip install -U EBNFParser