Repo enhancements

2 little enhancements :
- use off csharp diff in git to have method and class names when displaying a diff
- add a file to autoconfigure compatible editors to project tabs and space configuration to prevent bad configuration for new developpers on the project... Some details on that :

Using the EditorConfig Extension http://visualstudiogallery.msdn.microsoft.com/c8bccfe2-650c-4b42-bc5c-845e21f96328 ,
See http://editorconfig.org for more details

Do want you want with that ;)