Add checkpoints

Add more checkpoints starting with the hard fork at block 25200.
Add checkpoints

Add some more checkpoints.
IRC | getnetworkhashps | Update checkpoints

Changed the IRC channel so we can hopefully do away with the rogue peers
with 300K blocks.
Added a fix to the getnetworkhashps method noted in
https://bitcointalk.org/index.php?topic=124303.msg2515204#msg2515204
Updated checkpoints
Change client name

Change client name from Satoshi to GameCoin. This will make it easier to
identify peers using the proper client.
Minor readme fix
Update link to forum topic in the readme
Compulsory Update [By August 15th 2013]

Fix dodgy peers issue, most should be ignored initially with the
remainder dropping by the wayside after the deadline at midnight on
August 15th 2013.
Add more checkpoints.
Hard fork to protect the network

Due to the unbalance between the difficulty swing introduced in the hard
fork at block 25200 GameCoin was potentially left open to an attack with
far less than 50% of the network. This commit reverts this part alone,
the difficulty retarget will still be at 48 block intervals.
Update Checkpoints.
Merge pull request #4 from Petr1fied/master

Updates to Gamecoin