Add group name to the notification subject

[hypeJunction]

Could we maybe prefix the notification subject with the group name, so that:

1. It's easier to identify where the discussion is taking place
2. GMail and other clients that group emails into threads do a better job at keeping those grouped by context. Now it's just a long thread that you have to filter to figure out what is what. Now that the Feedback and Planning group is the place for dev discussions, I would like to keep the notifications in one place and prioritize them when scanning my email.

[juho-jaakkola]

Notification subject will include the topic title once we upgrade the community to 1.9.

But it's a good point that having also the group name in the subject would give even more control on organizing the emails.

However I wonder if the subjects would become too long.

[mrclay]

@beck24 is there a good reason we should use your notifications subjects plugin for this? How's the perf impact on very large groups?

[mrclay]

@beck24 typo: is there a good reason not to use that plugin?