Merge PR fclairamb#71: Dealing with file access errors

Fixes issues fclairamb#66, fclairamb#69, fclairamb#70

Merge pull request fclairamb#31 from fclairamb/mlst-support

MLST support

Merge pull request fclairamb#32 from fclairamb/error-on-file-access

Checking if we can write the file *before* opening the transfer connection

Merge pull request fclairamb#17 from fclairamb/travis-setup-releases

Travis setup releases

file