change train structure
Changed almost everything. See README for details.
	modified:   identify_lang.py
Removed a lot of train files. They were too small anyway
Rename train files to language code (Wikipedia codes)
	renamed:    dog.de -> de
	renamed:    dog.en -> en
	renamed:    dog.es -> es
	renamed:    dog.fr -> fr
	renamed:    dog.hu -> hu
	renamed:    dog.it -> it
	renamed:    dog.nl -> nl