merged, fixing generateHashFormula and compareTo

merged changes, compareTo now passes test
generateHashFormula is now fixed and should be working
still working on unit tests so hashFnTest is not up to date
will fix then push again
HashFnTest now compiles
Merge branch 'master' of https://github.com/amnuxoll/EpMemHashing.git
merged issues

merged so WME has methods to return string versions of attribute and
value.
SweetSpotHashFn now has method to get a string version of both attribute
and value together to be used in the unit test to make sure that the
hashFormula is being sorted correctly.