Fixed some MODS and MADS RDF property and class names.

locationPhysicalLocation --> locationPhysical
Copy --> LocationCopy
related --> relatedItem
Rreview --> Review
mainTitleElement --> MainTitleElement
hasTranslatedVariant --> hasTranslationVariant
Date{Start,End} --> date{Start,End}
Merge pull request #6 from peichman-umd/modsrdf-names

Fixed some MODS and MADS RDF property and class names.