included tags for GA templates in several languages
deleting useless option tag
refactoring regexps to new utils.maps module
refactoring to use new utils.maps module
drop tags.py --> maps.py
fixing bug in calculation of revision text hash
deleting unused import re
Using standard IOError to handle problems opening dump files
Merge branch 'v1'

Conflicts:
	wikidat/sources/pages_meta_history.py

Moving regexps to identify FA, GAs and track supported file
dump extensions to module utils/maps.py.