clean file descriptor on detach

add close, detach and make file descriptor non-blocking

update readme badges

more renaming VeniceX to Zewo

Update to August 4, 2016, sync with quark, add tests

Updated to Swift 07-25 (#28)

Bump Swift to 05-31 (#26)

Updating Swift 05-09 (#25)

Merge pull request #22 from tomohisa/master

Update for 2016-05-03 Snapshot

Merge pull request #21 from VeniceX/hd/04-25

Updated for Swift 3 04-25