Add Implicit Connection with Secure Data

[simy307]

Currently a connection can be made with the "Implicit" option. However the data being transferred is not encrypted and an error would be passed down from the server

522 Data connections must be encrypted

This change would allow a connection with both an "Implicit" connection type and "Secure" data.

[icetee]

Hi, thank you for the PR! I try to test it soon.

[icetee]

Please no change version number!

[icetee]

I watched your code, but is the same as if I set "secure": true. If true, then encrypted data and commucation channel.

Otherwise, I get an error:

events.js:167
      throw er; // Unhandled 'error' event
      ^

Error: 11000:error:1408F10B:SSL routines:ssl3_get_record:wrong version number:openssl\ssl\record\ssl3_record.c:252:

    at Socket.ondata (internal/wrap_js_stream.js:62:22)
    at Socket.emit (events.js:182:13)
    at addChunk (_stream_readable.js:280:12)
    at readableAddChunk (_stream_readable.js:265:11)
    at Socket.Readable.push (_stream_readable.js:220:10)
    at TCP.onread (net.js:638:20)
Emitted 'error' event at:
    at TLSSocket.onerror (D:\DEV\_forks\node-ftp\lib\connection.js:311:10)
    at TLSSocket.emit (events.js:182:13)
    at emitErrorNT (internal/streams/destroy.js:92:8)
    at emitErrorAndCloseNT (internal/streams/destroy.js:59:3)
    at process._tickCallback (internal/process/next_tick.js:174:19)