Fix/readme
Some systems may have troubles since the 2 "readme" files share the same name if we ignore the case. I rename Readme.md -> README_old.md to fix this.
I also updated the .gitignore to ignore local installations of dolmen
Some systems may have troubles since the 2 "readme" files share the same name if we ignore the case. I rename Readme.md -> README_old.md to fix this.
I also updated the .gitignore to ignore local installations of dolmen