Investigate error message when using scp and the folder exists

[apostergiou]

Error message:

$ ./mistry build --host localhost --port 8462 --project simple_with_directory \
 --group foo --target /tmp/foo --transport scp -- --x=$RANDOM

/tmp/mistry: Is a directory

The project used should produce artifacts with a directory structure depth equal or bigger than 3.

e.g.

files
└──more_files
    └── foo.js