addred KRN ekrona support
added FRY Frycoin support
fix stack trace spew caused by some routers' UPnP implementations
Change LEAF explorer to one on correct block chain

Change LEAF block chain explorer to one that is on correct block chain.

There was a required change - adding Kimoto's Gravity Well to Leafcoin, and it was applied at block 18818 (in "gravity fix - 3"), but not all updated - so there is a block chain fork.

Leafcoin source: https://github.com/leafcoin/leafcoin
More info: https://bitcointalk.org/index.php?topic=430091.0
Merge pull request #35 from EA5/patch-1

Change LEAF explorer to one on correct block chain
added DGB DigiByte support
Merge branch 'master' into krn

Conflicts:
	p2pool/bitcoin/networks.py
	p2pool/networks.py
Merge branch 'master' of https://github.com/Rav3nPL/p2pool-rav
Merge https://github.com/forrestv/p2pool into forrestv
Remove "punish share" stuff, it is messing too much on fast altcoins
Added AKC AntiKeiserCoin support