"Person" string/object only requires a name. Allow uppercase characters in package names.

"Person" string/object only requires a name. 
Removed email and url requirement for Person string and object. Updated the regex and logic for validating the "Person" string. Unit tests added.
Resolves gorillamania/package.json-validator#12


Allow uppercase characters in package names. 
Resolves gorillamania/package.json-validator#14