Fix Dedication Loss on Logout

Added a fix to dedication loss on log out. Used subpower on rings and
added an addMod for MOD_DEDICATION_CAP to the effect\dedication lua
file.

If you see anything off about this just let me know in the comments and I'll fix it right up. Tested on my test server and didn't have any issues. 
Emperor is 3000, but empress is 1500. SE's post made an error because in game the on screen text for the item says 1500.

Also verifiable by polutils and by ffxiah http://www.ffxiah.com/item/15762/empress-band