Naming of eth and ERC20: "FAB" -> "FAB-GAS" and "ERC20" -> "FAB"

[andrea-dintino]

We are introducing an ERC20 (token) used to trade goods and services, next to the eth (coin, currently named "FAB"), needed to pay transactions.
This ERC20 will be initially (maybe forever) not exchangable with the eth. In order to keep things simple and stick to Ethereum standard name, we should use a naming policy like:

• ERC20 = "FAB"
• Eth = "FAB-GAS"

Currently this requires only a change in this line