Update versions & readme
Add function for determining whether a site has multiple 'event organisers'.
Clear single-organiser site cache when an event changes status.
Fix CSS styling for event admin menu item
Add 'event-venue' to 'supports' array
Only display venues in calendar drop-down or event modal, if venues are enabled.
Only add venue admin page if venues are enabled.
Only display venue drop-down in event admin page if venues are enabled.
Only display venue fields on the event edit page if enabled.
Only display venue related options in settings page if enabled.
Only register event-venue taxonomy if enabled. Check for WP_Errors when using WP taxonomy API.
Refactor how widgets are registered. Only register venue widget if venues are enabled.
Hide 'author' column if on a single-organiser install, and hide venue columns if venues are not supported.
Fixes bug where relative queries with eo_get_events() return uintended results. The function igonores the time part. Remove it here as relative queries for 'event_[start|end]_[before|after]' are handled at pre_get_posts. TODO: 'ondate'  be handled there too?
remove duplicates, fixes #187
Fix class extension
If install version is not found, run through install routine.
To eo_get_blog_timezone() unit tests.
Merge pull request #188 from coubeatczech/i187

remove duplicate translations in /po file, fixes #187
Support quoted timezones. Fixes #191.