Add missing import

pootle_store/decorators.py was missing Store import and thus caused
tracback with: NameError: global name 'Store' is not defined trying to
download a file.
update_against_templates: Add some debug output
pootle_app: Don't catch naked exceptions
pootle_app: Import pootle.scripts.hooks only once
pootle_app: Import pootle_misc.versioncontrol only once
update_against_templates: Rewrite the command to be closer to the metal
allauth: Enable OpenID and Persona login support by default