Release of 1.0.1

- Merge pull request #1901 from akarnokd/RedoRequestFix
- Restore timeout on the test.
- Fixed redo & groupBy backpressure management
- Merge pull request #1893 from akarnokd/MergeDelayErrorFix
- Avoid request(0) to trigger a recursive call.
- The backpressure exception might cut ahead of all onNext events.
- Fixed incorrect error merging.
- Version 1.0.0
