v0.4

We've had an issues with GINcoin recently where blocks were very slow, and the mining calculator was off because it assumed a block time of 120 seconds. I have fixed this by dynamically calculating blocktime. I am now also calculating block reward versus assuming a static 10 GIN. These are some major steps towards making sure this calculator will be coin agnostic. In the future adding a coin should be as easy as running a daemon and adding a single line.