Release share v0.28.0 (2021-07-06)

=== Breaking changes

* lib/ssh: rename method Get to ScpGet and Put to ScpPut

  This changes is to make clear that the methods to copy the files, either
  from local or from remote, is using the "scp" through exec package,
  not using the native SSH file transfer protocol.

  While at it, use consistent log prefix for error message.

* ssh: rename the NewClient function to NewClientFromConfig

  This is to differentiate it with x/crypto ssh package that have the same
  function name.

* ssh: move the config parser to subpackage "config"

  There are two reasons for moving to sub-package.  First, the code for
  parsing the ssh_config(5) take almost 99% of the lines in the ssh package.
  Second, in case we want to submit the code to upstream,
  golang.org/x/crypto, we need the package to be independent, less external
  dependencies as possible.

* http: remove the Memfs field from Server

  Now that Options field has been exported, we did not need to have
  duplicate Memfs, so this field is removed in favor of Options.Memfs.

=== Enhancements

* websocket: export the Options field on the Server

  Previously, the Options field is not exported to prevent user from
  changing it once it set through NewServer() function.

  This changes export the Options field to allow user of Server access its
  values.  We can create a method on server to return read-only options,
  but that will over complicated the Server API.

* http: export the Options field on the Server

  Previously, the Options field is not exported to prevent user from
  changing it once it set through NewServer() function.

  This changes export the Options field to allow user of Server access its
  values.  We can create a method on server to return read-only options,
  but that will over complicated the Server API.

* websocket: store all the handshake headers to Handshake.Header

  Previously only non-required headers are stored in the Handshake Header
  field, while the required header value stored on their respective fields.

  This commit store all request header key and values into the Header field.
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