almost done except printing title
notification model added.
send notifications if mentioned
create notifications showing page
date showing added.
notifications unread/all view update.
Notification Unread/read feature added.
make link all users to profile page using draper
also comments
make projects and histories link
refactoring referenced projects and histories in profile page
refactoring profile page using has_many method
reference library added.
library comment added.
not found bug fixed.
match parameter passing added.
add replace bang method, history_helper refactored.
fixed todo reference bug (regex), history association code is using ReferenceCheck now
markdown support
change implementation (mixin to inheritance)