Merge pull request #144 from rafalp/develop

Merge 0.3 into master branch
Merge pull request #145 from rafalp/develop

Bugger
Add WhooshEngine by default
Fix bad copy/paste
Add a default search index dir
Added missing import + check target type before move.
Added delete_date for holding date for "Xyz deleted this on sometime", made Misago more vigilant about keeping current_date up to date for search index.
Typos in mixin name.
Use correct roles when building ACL's.
Don't include user name in post index content.
Tweaks in indexing features.
Merge pull request #148 from kasperisager/master

Fix Whoosh settings
Sort results by revelance.
Fixed syntax error.
Correctly count thread participants.
Corrected function call
Changed search views for objects as preparation for #149.
Another blurb fixed.
Ignore antiflood during edition.
Fixed private threads participants check on new reply.