EditorConfig is awesome: http://EditorConfig.org

.editorconfig

# editorconfig.org
root = true

[*]
indent_style = tab
end_of_line = lf
charset = utf-8
trim_trailing_whitespace = true
insert_final_newline = true

[*.md]
trim_trailing_whitespace = false

[*.{html,twig,kit,styl,less,css,js,md}]
indent_style = space
indent_size = 2

[*.py]
indent_style = space
indent_size = 4