Changed priority of save_post hooks to avoid conflict with ACF's save_post hooks. Fixes #76.
Removed an obsolete save_post hook.
Added a `test_event_inherits_season_from_production()` test
Started working on WPT_Importer class (#15).
Added some more documentation to WPT_Importer.
Removed all static calls to public methods.
Fixes #77
Finished documenting all methods of WPT_Importer.
Added tests for the new WPT_Importer class (#15).
Started working on improvements on event listings to better support historic events (#75).
Removed the `upcoming` and `past` attributes for the `[wpt_events]` shortcode.
Finished rewrite of WPT_Events and WPT_Listing classes.
Merge branch 'issue-77' into issue-75
Added a test for paginated listings with historic events. Closes #75.
Finished rewrite of WPT_Listing, WPT_Events and WPT_Productions.
Added year pagination to event listings. Closes #70.
Merge branch 'issue-76' into v0.10

Conflicts:
	functions/wpt_setup.php
Added a warning to WPT_Importer. Closes #15.
Merge branch 'issue-15' into v0.10
WPT_Importer tests were using deprecated methods.
All widgets were casuing PHP warning. Closes #78.
Added an 'order'-option to event and production listings.
Closes  #71.
Ready for v0.10!