Add criteria parsing

[zbarge]

Need a parser that can parse the following:

• criteria groups split vs merging
• AND vs OR vs None
• Operators (Like, not like, null, not null, equal, not equal, greater, etc.)
• Should be easy to reuse between Pandas and SQLAlchemy
• Should integrate a 3rd party library to handle most parse work since this should be a common wheel to invent..

To be created:

• Base Class
• to pandas
• to SQLAlchemy