Remove --init argument
API: Fix category and srid handling
Add CitySDK exporter

Export categories, places and events with '$./manage.py event_export CitySDK --new'
Delete exported from target system  '$./manage.py event_export CitySDK --delete'
Add minor refactorings and pep8 fixes
Add documentation. Remove swagger.
Fix failing migration. Remove language field. Rename categories > keywords.

Event should be able to have multiple languages,
implement this in the future.
Documentation update.
Remove field category_for. Rename categories>keywords.
Clarify import output.
Import keywords for matko events.
Removed redundant tprek location import code.
Merge commit 'a9f64d2c8f4102cb7806390b7c214f1771247790'

Also added simple client HTML for API event search

Conflicts:
	linkedevents/settings/base.py
Add option --cached to enable caching
Import some locations from Matko database
Fix Kulke importing
Add URL field to Place
Implement tprek undeletion
Add import script
Fix typo in event importing
Merge commit '50d838f9a3e34ab8b3da83e3f1862d3a4101fc89'