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- Swift 3

Fix cocoapods

- Fix sid bug

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Update readme

Merge branch 'development'

* development:
  bump version
  add check for bad paths
  Fix socketpollable crashing
  make nonobjc
  More privatisation
  Making publicKeyChainForTrust() private.
  api extensions doesn't seem to fail for me
  update readme
  don't use api extensions only

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Merge pull request socketio#408 from socketio/development

Development