Merge pull request #2787 from elixir-lang/emj-hex-file-error

Report correct location if local.hex failed

Signed-off-by: José Valim <jose.valim@plataformatec.com.br>
Move printing out of copy_path, always create dir

Signed-off-by: José Valim <jose.valim@plataformatec.com.br>
Update CHANGELOG