OPR V4 Update

oprv4.txt

The new release has a few hardforks:
- OPR version goes to v4. Includes additional assets 
  https://github.com/pegnet/pegnet/blob/larger_limit/modules/opr/assets.go#L76-L89
- Ecdsa signatures for Pegnet transactions
  Use branch `rcd-e` on `FactomProject/` + factom-walletd, factom, and factom-cli
- PEG Limit per block increases by 500 per block where pUSD is under $0.99, down by 500 when above $0.99
 
 
 Use branch `larger_limit` on pegnetd and pegnet
 
 Run pegnetd and pegnet with --testing --testingact=ACT_HEIGHT
 
 Will need to modify `pegnet` miner to manually change pUSD price, it will pull from pegnetmarketcap
 
 
 
 Branches:
 FactomProject/factom           rcd-e
 FactomProject/factom-cli       rcd-e
 FactomProject/factom-walletd   rcd-e
 pegnet/pegnet                  larger_limit
 pegnet/pegnetd                 larger_limit