Update local and remote paths generation

[vkhodygo]

Replace lines at

Rynner/rynner/rynner.py

Line 81 in 6dcd21e

dest = remote_dir + '/' + directory_name # FIXME os independent

and

Rynner/rynner/rynner.py

Line 147 in 6dcd21e

# fixme os indepedent path

with proper OS-relevant counterparts.