Boolean-parser

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- :pr:`9` - Adds support for booleans, dates, and datetimes
- Fixes :issue:`10` - no boolean support
- :pr:`8` - Updates docs and tests

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- :pr:`6` - Adds null and date options, fixes ilike, like operators
- Fixes :issue:`5` - no value bindname
- Fix some dependencies.
- Add operand syntax table to documentation

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- Fixes :issue:`3` - bumps ``sqlalchemy`` version to >1.4
- Fixes :issue:`2` - clarifying docs on toy examples

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- Adds support (:pr:`1`) for aliased SQLAlchemy models

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- Initial commit of repo
- Created basic boolean syntax parser, ``Parser``, using pyparsing for words and logic expressions
- Added ``sqlalchemy`` mixin to filter a parsed string into a sqlalchemy filter
- Added ``SQLAParser`` for parsing ``sqlalchemy`` filter strings
- Added general ``parse`` function
- Added expanded test suite for general and sqlalchemy parsing
- Changed global params dictionary to a list; compared to original sqlalchemy_boolean_search code
- Initial documentation