Explore page: story titles should be left justified. (#576)
Show user an error message on uncaught exceptions

Addresses #623
Merge pull request #620 from patternleaf/576-left-justified-titles

Explore page: story titles should be left justified. (#576)
Update changelog.

Update changelog to mention fix for #576 that @patternleaf implemented
in 418a38e21951b8251aaface0756d65ebeefbe262