Merge branch 'master' of https://github.com/frankdilu/CheLang

input to exit weekends and feriados

bugfix with Empty class in Interpreter

Fix issue #5

 changed keywords "run" => "Correme", "len" => "TaLargo"

        added actual folder in console
        print a line for return in cli.py
        "Viborita(str)" built-in function added as eval() => python code
        "ANumerito(n-str)" built-in function added as int()
        "ANumerito(n-str)" built-in function added as float()
        "ATextito()" built-in function added as str()
        "FloatYPico()" built-in function as float()  - .5
        updated context name of built-in function
        built-in functions declaration in self file

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Examples