import: initial upload

- metro6_orig.ino is the original (bugged) file I've done most of my testings
  on
- metro6.ino is the fixed version
- metro7.ino is the final file than can calculate itineraries with up to 2
  changes, it has a bug I couldn't track down through so I couldn't use it
  in my presentation

Signed-off-by: Adrien Tétar <adrien.tetar@hotmail.fr>