Allows users to log in with their Twitter account and provides access to the Twitter API.

This plugin was split from the original Elgg project code on 2017-07-28.

The following command was used: git filter-branch --prune-empty --subdirectory-filter mod/twitter_api master

See also: https://help.github.com/articles/splitting-a-subfolder-out-into-a-new-repository/