GDK: Add eachDirMatch and eachDirRecurse on File

on File the GDK has following methods

void eachDir(closure)
void eachFile(closure)
void eachFileMatch(filter, closure)
void eachFileRecurse(closure)

for coherence it would be good to have:

void eachDirMatch(filter, closure)
void eachDirRecurse(closure)

See discussion in dev mailing list:
http://www.nabble.com/Adding-eachDirMatch-and-eachDirRecurse--tf3473673.html#a9694265