Adding expiration filter. Fixes #118. Fixes #100
Update AccumuloLastNStore.java
Using Expiration helper class in ExpirationFilter instead of trying to pull values out of a hashmap by hand
Merge branch 'master' into expirationFilter

Conflicts:
	store/lastn-store/src/main/java/org/calrissian/accumulorecipes/lastn/impl/AccumuloLastNStore.java
Merging master and fixing issues
Merge pull request #178 from calrissian/expirationFilter

Expiration filter