Fixes and New validations

Adjust Validations: 
Rule_Length, Rule_Numeric, Rule_E-mail, Rule_Min, Rule_Max, Rule_NotEmpty.

New Validations:
Rule_Checked, Rule_Digits, Rule_DigitsBetween, Rule_Cpf, Rule_Cnpj.

Implementation:
_trim.

Now it's possible define min and max for string, min and max for a checkbox, required checkbox (or radio), select and textarea, float numbers for numeric field with possibility to choice dot or comma separation. And other little changes.