adding dependencies for apache.commons.StringUtils and for log4j
adding updated constructor methods and updated equality and hash codes. Equality and HashCode overriding functions were added so that these objects would be properly added to the HashMap based StemEntryFrequencyMap object.
adding toString function for easier visual debugging
adding unit tests
modifying unit test to so it tests for the right things and so that it will print out the map to the console for easy viewing.
StemEntryRunner Works
StemEntryRunner Test Works