#75 integrated string to joda-time conversion
#75 got rid of hard dependency to joda library and added conversions for java.util.Date and java.util.Calendar
#75 Adapting to changed model types after rebase
#75 Adding Timo to copyright.txt; Making Joda an optional dependency; Merging ClassUtils into NativeTypes
#75 Some re-organization in Conversions etc.
#75 JavaDoc