getters and setters for locking article
AENV-257 - Locked articles can be loaded
tables, data update for article locking mechanism
user handler for article API
added a new endpoint for article API to lock, unlock article
return a proper status code when trying to set the same lock status
spec for API's ArticlesController
articles controller spec improvement
locking mechanism improvements
clear AES plugin link
getArticle improvement
create a single API route for locking/unocking
changed returned status code for unlocking article
api documentation fix
Merge pull request #884 from takeit/AENV-257

Aenv 257 & API endoint for AENV-280