Added data value support for Spawn Eggs

Previously the string returned would be brief, and just display 'Spawn Egg', this will now support data values, for example a Mooshroom Egg will return a string of 'Spawn Mooshroom'.
Added data value support for Spawn Eggs

Previously the string returned would be brief, and just display 'Spawn Egg', this will now support data values, for example a Mooshroom Egg will return a string of 'Spawn Mooshroom'.
Merge pull request #11 from DoctorDark/master

Added data value support for Spawn Eggs