import_welt2000: Fixed missing application context

Fixed issue #128
Fixes INSTALL.md file commands to match actual file locations
Merge pull request #129 from Turbo87/app-context

import_welt2000: Fixed missing application context
Merge pull request #130 from bbonamin/master

Fixes INSTALL.md file commands to match actual file locations
model/event: Skip creating club join events with empty club

Fixes #131
Merge pull request #132 from Turbo87/empty-club-event-fix

model/event: Skip creating club join events with empty club