Add hook for checking repository settings

Signed-off-by: Michal Čihař <michal@cihar.com>
Set default push strategy for git

Fixes #607

Signed-off-by: Michal Čihař <michal@cihar.com>
Use single data directory

Now all data is stored under DATA_DIR and Weblate manages subdirs on
it's own. Based on forseeable increase in directories we need to manage,
this is the only way forward.

Fixes #604

Signed-off-by: Michal Čihař <michal@cihar.com>