Logmine under Apache licence

[lopozz]

It would be usefull to have LogMine under a more permissive licence. I could open a PR to modify the replace the existing code under GPL (alignment.py) and have the whole algorithm under Apache.

[zhujiem]

It would be very nice. Welcome your contribution on this.

[lopozz]

Sure done. I'm already on it, I think I'll be able to do the pull request this same week or the next :)