Merge pull request #165 from valeriomazzeo/code-coverage-fix

import Foundation to fix code coverage issue

Merge pull request #152 from vapor/beta

sockets beta

Merge pull request #152 from vapor/beta

sockets beta

fix isclosed typo

update error struct

remove redundant isClosed checks

prerelease version updates

Merge pull request #161 from vapor/feature/better-getaddrinfo-errors

Improves error messages when `getaddrinfo()` fails

correct 3.0 dep

Merge pull request #150 from gwynne/throw-socket-closed-error

Throw better errors for closed sockets