* [bugfix] mods_str shouldn't add DT when it's NC by jamesguessis
* [doc] add more advanced example usage
* [feature] add mods_from_str
* [feature] add touch device mod
* [bugfix] fix max combo calculation for beatmaps < v8
* [bugfix] make sure acc_round returns integers
* [bugfix] just use string.find() to skip any BOMs
* [bugfix] only do utf8 hack on py2.7