change signature to include transpose type and improved scaladoc
change signature to include transpose type and improved scaladoc

mredaelli/breeze,crealytics/breeze,scalanlp/breeze,chen0031/breeze,sheide/breeze,cilier/breeze,wstcpyt/breeze,calippo/breeze,claydonkey/breeze,nikdon/breeze,ContentSquare/breeze