Small fixes and improvements before next release#61

Merged

fizyk20 merged 3 commits intofizyk20:masterfrom

novacrazy:master

Mar 22, 2018

Commits on Mar 14, 2018

Improve examples in tests, add back `SequenceItem`, and fix `GenericArrayIter` Send/Sync.
novacrazy
committed

Commits on Mar 15, 2018