Added a clusterNIL method that clusters NILs based on alternative strings given one differs from original string
Merge branch 'master' into clusterNilsByAlternateString
Merge pull request #23 from jgilme1/clusterNilsByAlternateString

Cluster nils by alternate string
Fixed state abbreviation bug and removed import weka statements
Merge pull request #24 from jgilme1/stateAbbrevBug

Fixed state abbreviation bug and removed import weka statements