Added test to collection tile, to show date isn't handled properly. refs #463
Added check in Date function for content listing brains/objects. refs #463
Updated test for dates on collection tile. refs #463
Updated change log
small typo
Use callable for checking is date is a function, refs #464
Change log entries on top of others, #464
Check if date is callable and return callable or non-callable date, refs #464
Merge pull request #464 from collective/issue_463

Issue 463 - fix to show dates in collection tile