nurse sched prob with a maxShiftsInRow function added steeply to
fitness.
merging?
nurse works except for cost.
lots of lambdas and cool user options for optimization.
Merge branch 'master' into nurse-constraints

Conflicts:
	src/optimizer.java
	src/problems/NurseSchedProb.java

NOTE: The Demo file will need to be updated to conform to new
      NurseConstraints constructor.