Add @ Mention Back into 15.2

Issue No: HD-850
Created 7/20/2015 4:18:02 PM
Type Feature
Priority Major
Status Closed
Resolution Fixed
Fixed Version 15.2
Description [~jayson.ramos] - Please add all logic needed for the "@" Mention logic back into 15.2.   I mistakenly asked you to remove it from 15.2 back in May, not realizing it was supposed to be in that version. My mistake. Please add it in exactly as you have it in 15.3 and we will need to test thouroughly.