v0.4.2

NMF v0.4.2

Diff since v0.4.1

Closed issues:

• Convergence history (#7)
• :multdiv always gives a NaN matrix and a zero matrix (#15)
• :multmse fails; returns zeros all the time (#16)
• weird MethodError (#28)
• New version tagging (#41)

Merged pull requests:

• fix #16: initialize H in nnmf (#25) (@korenmiklos)
• [Breaking] Add greedy coordinate descent algorithm (#38) (@tsano430)
• Fix#15: Avoidance of zero division (#39) (@tsano430)
• Fix #28: Check the elements of X (#40) (@tsano430)