Renamed methods and variables
Implemented validation of CNPJ
Fixed the description
Included the NuGet file
Updated the version to 0.2.0.0
Changed the method IsValid to Validate. IsValid misleads to be a instance method, not a static one.
Changed the method IsValid to Validate. IsValid misleads to be a instance method, not a static one.
Cleaned up code
Implemented a micro optimization in the checksum algorithm