Display and send media alt text

[vanita5]

Upload media with alt text example:

T.post('media/upload', { media_data: b64content }, function (err, data, response) {
  // now we can assign alt text to the media, for use by screen readers and
  // other text-based presentations and interpreters
  var mediaIdStr = data.media_id_string
  var altText = "Small flowers in a planter on a sunny balcony, blossoming."
  var meta_params = { media_id: mediaIdStr, alt_text: { text: altText } }

  T.post('media/metadata/create', meta_params, function (err, data, response) {
    if (!err) {
      // now we can reference the media and post a tweet (media will attach to the tweet)
      var params = { status: 'loving life #nofilter', media_ids: [mediaIdStr] }

      T.post('statuses/update', params, function (err, data, response) {
        console.log(data)
      })
    }
  })
})