v0.3 - Transfer fix and cleanup
- Correct handling of files transfer in case of error, thanks to @byrnedo for reporting #30
- Strengthen the tests to make them more stable using secsy/goftp to test active and passive transfer
- Added MLSD command support
- Allowing non-standard transfer file port (not 20)
- Various code cleanups
- Added the code of conduct (everybody is nice in Goland anyway)