Pull back hard fork

Due to us hitting block 62500 a lot sooner than I anticipated and not
being able to get new clients in place fast enough I've had to go with
the majority of the users and checkpoint the fork mined with the older
clients.

As such I've moved these changes to come into force at block 64000
instead.

Apologies for any inconvenience if you updated ahead of this and ended
up on the now invalidated fork.
Update readme

The change to the hard fork block will add another 1 million coins to
the total generated.
Merge pull request #8 from Petr1fied/master

Move hard fork to a higher block to give people time to update