New Features

• Implement support for BufferedProtocol.
  (by @1st1 in a959f27, 76b34be, f9c4393)

• Implement loop.start_tls().
  (by @1st1 in 622ed9c)

• Add Server.get_loop().
  (by @1st1 in 6a42f84)

Bug Fixes

• Fix Server to wait in wait_closed() until all transports are done.
  (by @1st1 in 124e981)

• SSLTransport.abort() should mark the transport as closed.
  (by @1st1 in 4d6621f)

• Fix 3.7 32bit builds.
  (by @1st1 in a68f3c9, b5b4abb for #172)

Build

• setup.py: Detect if the libuv submodule has not been checked out.
  (by @1st1 in a190cdd)

• Fix race between futures cancellation and loop.remove_reader() /
  loop.remove_writer().
  (by @andr-04 and @1st1 in cb0a65a for #169)

• Enable 3.7 CI on Travis and build wheels for 3.7.
  (by @1st1 in 37f964b for #179)