[Release 1.4.x] Activity System 1.0

[atomjani]

This is big work?
Activity:7.75%
This is suggest the user that write more post, thread or vote. Example he see her activity is 7.99% and he will writing to 8% activity. And the next moment he have bigger number.

And I think TOP activity list sort by activity, when we click to 7.75%
This load to new page, when we can see example:
1. John: 74.45%
2. Leslie: 63.25%
3. Caribe: 44.33%
etc.