Fix issue #372: Don't print `class` attribute with empty value for Diet template
Merge pull request #519 from nazriel/issue372

Fix issue #372: Don't print `class` attribute with empty value for Diet ...
Update app.d

nicer way to write duration in seconds (just warming up with this module, cause i need to use it now ^^)
Merge pull request #522 from Extrawurst/patch-3

Update app.d
Fix HTTP client in conjunction with non-SSL connections (null pointer dereference). Fixes #523.
Add initial support for Redis Pub/Sub.
Revise Redis Pub/Sub method signatures and implement the callback mechanism.
Redis Publish takes string arguments only.
Move Redis subscription listening code to RedisSubscriber.
Make RedisSubscriber.listen() asynchronous.
Add Redis Pub/Sub async subscribe/unsubscribe support.