Add fMeasure.
Merge branch 'master' of https://github.com/kuoliu/ActiveLearning into HEAD

Conflicts:
	src/edu/cmu/al/experiment/EvaluatorInterface.java
No changes
Merge branch 'master' of https://github.com/kuoliu/ActiveLearning into HEAD

Conflicts:
	src/edu/cmu/al/simulation/BasicLabelingSimulation.java
	src/edu/cmu/al/simulation/testSimulation.java