testPmtk3 error | caused by printPmtkFigure "need to specify folder" | Windows 10 | Matlab R2018a

[rrmina]

I tried using testPmtk3 in Matlab R2018a
Windows 10

and this is what I got

So I check the source code for printPmtkFigure.m which is actually the main cause of error and it seems that there's no error checking for windows os? In fact, there's no definite folder mechanism that may contain this error (say a default folder). Will you accept PR if I make general fixes for this error?

[rrmina]

fixed in #137