file API enhacements
Added getters/"fallback" handler for unrecognized properties in File domain objects
Added paging for get folder items
Added missing fields parameter name.
Domain model refactoring
Added BoxType enumeration
Changed Date fields to Data type.
Added BoxFolderUploadEmail box object
Folder and FolderMini attributes
File and FileMini attributes and hierarchy
Removed unused domain objects
More fine-grained box exception handling
Updated pom.xml