Added extra checkpoint upto block 1525492
Added extra checkpoint upto block 1525492

SandCoins/sandcoin-wallet,SandCoins/sandcoin-wallet,casinocoin/casinocoin,SandCoins/sandcoin-wallet,SandCoins/sandcoin-wallet,casinocoin/casinocoin,casinocoin/casinocoin,casinocoin/casinocoin,SandCoins/sandcoin-wallet,casinocoin/casinocoin,casinocoin/casinocoin,SandCoins/sandcoin-wallet,SandCoins/sandcoin-wallet