Update dogecoin.json

Updated peerMagic and peerMagicTestnet for Dogecoin according to latest updates of main nomp repo.
Create saffroncoin.json

Added saffroncoin into /coins.
Update saffroncoin.json

Typo in SFR coin.
Update saffroncoin.json

Since I seem to lost this every time...

https://github.com/saffroncoin/saffroncoin/blob/master/src/chainparams.cpp#L25
Merge pull request #118 from Ondalf/master

Update Dogecoin and add Saffroncoin