[yaldaram] Post Activity v0.3

Hello,

Description:
It shows post activity page where post activity of certain user will be shown per forum basis.

In v0.3 the code has been optimized and is now using very little resources from sql database.

Change Log:
Update: v0.3: Now posts are ordered descendent.

Installation:
Upload the .zip archive in your forum's root and Extract. Activate it in AdminCP > Plugins Manager.