Twitter refactor data

[rowasc]

This pull request makes the following changes:

Attempts to solve Twitter compliance issues

• Tweet content and related data that we had from before we fixed this issue should be removed

  • For posts where the posts.content field matched a messages.message that was created from a tweet, replaced the message with the tweet's URL.
  • For posts where the posts.title field matched a messages.message that was created from a tweet, replaced the title with 'From Twitter on {date}'`
  • For posts that had location data extracted from Twitter, removed the location data
  • Removing tweet's contents from the messages database after the previous steps are done.

• Twitter Usernames should not be saved

  • Removing contact usernames that we stored from twitter
  • For future tweets, saving the tweet user ID, instead of tweet username

• New tweets that we extract with php artisan datasource:incoming

  • Do not save the tweet's content. Instead, use 'From Twitter on {date}'` as the title of the post created and the Tweet URL as the content.
  • Do not save location data from Twitter

• Exports:

  • Add the data_source_message_id field to the CSV exports to be able to extract the tweet id
  • Do not export content for unstructured posts from Twitter.

Test checklist:

• [ ]

• I certify that I ran my checklist

Fixes ushahidi/platform# .

Ping @ushahidi/platform

[coveralls]

Coverage decreased (-0.1%) to 26.087% when pulling 517fabc on twitter-refactor-data into c94854b on develop.

[rowasc]

ugh no this should just be the opposite, null out the contact in message , and keep contact null constraint .