Author model update for twitter and other social-related websites author handling.
WebSite model: auto-create https://twitter.com/ website and keep it handy to avoid subsequent DB queries when creating twittos.
Author: method to create twittos.
Tweet/original data: process author, protect a little.
move a function to common.
invert the extract_and_set_title() logic test, we now have tweets.
mutualize creation helpers into a unique file.
review (but still not final) create tweet from ID.
new tweet fields (mentions, entities).
avoid crashing when tweet author misses information.
Try to avoid http://dev.1flow.net/1flow/1flow/group/48486/
Do not post-process tweet data if we are not a tweet (happens when an article comes from a tweet entities).
display things on certain conditions.
fetch tweet entities.
Implement basic entities fetching.
version bump for 0.84.12.
Merge branch 'release/0.84.12' into develop