Metodo GetDigits na extensao de strings
Create methods on PrimitiveExtensions to try parse object

Métodos de conversão e testes em:
- BoolExtensions
- ByteExtensions
- DecimalExtensions
- DoubleExtensions
- FloatExtensions
- IntExtensions
- LongExtensions
- ShortExtensions

https://github.com/jornfilho/.net-Dev-Utils/issues/2