Changing symbol to GRFT and grf:token clarification

To avoid confusion with a defunct Graffiti coin which used symbol GRF, we have decided to change the name of the coin to GRFT.

*The change was first announced on Telegraph and other social media channels around Jan 23, 2018.

To further clarify naming convention, grf:token is a NEM token that was used to transfer tokens to presellers. grf:token was issued pre 1:100 split, so the owners of grf:token receive 100 GRFT’s for 1 grf:token during the exchange.