Sub Colorize lastRow

[RaymondWise]

In Colorize the user selected range needs to have its last row identified:

lastrow = rngToColor.Rows.count

This presents a issue if the user selects A:A

Also, if a user selects a non-contiguous range, it should be checked as such, otherwise lastRow will be defined as the last row in the leftmost selection of the range. Actually, we should always check that #57