added NeighbourJoining implementation to Clustering module, checked code in ProfileAligner

	modified:   src/Clustering.jl
	new file:   src/DataReader.jl
	modified:   src/ProfileAligner.jl
	modified:   src/ProgressiveAligner.jl
Merge branch 'master' of https://github.com/latticetower/ProgressiveAligner.jl