E-mail notifications on comment replies setting

[aaronharding]

continuing from http://forum.getfuelcms.com/discussion/comment/8736#Comment_8736

This creates a setting which disables any attempts to send out email notifications on comment replies:

• wraps a check around the call to _notify in _process_comment in the blog controller
• hides the reply/notify section when editing a comment at fuel/blog/comments/edit/x
• updates to language files and blog setting files to list setting in fuel admin

[aaronharding]

ugh, obvs ignore this. it was meant for the develop branch.