Additional date methods in DatabaseExtractor
Moved DATE_FORMAT to base DryadObject class
Add method to getDateAccessioned
Factory method makeDryadObject
Implement date range checking on DataItemCount

Provides date range checking for files and packages
Failing test for date ranges

Next steps are to use DCDate instead of formatter, and implement
setDateAccessioned
Refactor date utilities to base class

Also note on why DCDate not used
Add setDateAccessioned to DryadObject
Use Date.before and .after instead of compareTo
Tests for counting data packages by date