Tweak that when the `EnablePublishParallelSend` option is true, it wi…

…ll be put task into the .NET thread pool in batches rather than all at once. (dotnetcore#1540)

Fixed an issue where the PublishDelay synchronization method did not …

…wait internally.

Update docs.

Merge branch 'master' of https://github.com/dotnetcore/CAP

Upgrade Microsoft.Data.SqlClient to version 5.1.4

Update docs & code cleanup.

Try new appveyor.yml

The options EnableConsumerPrefetch and UseDispatchingPerGroup will wo…

…rk together without interference. (dotnetcore#1399)

The send task will be executed by the .NET thread pool, and whether t…

…he consume task is executed in parallel by the thread pool depends on the EnableConsumerPrefetch configuration. (dotnetcore#1380)

Fixes: using ValueTask to avoid thread blocking when enable UseDispat…

…chingPerGroup option. (dotnetcore#1356)