Staking rewards

[hav-noms]

Also made the Distribution Authority public as we couldn't see it before.
This now needs

• Unit Tests migrated
• Deploy Script to accomodate Deploying instances
• Update deployed contracts to include
• 1. uniswap sETH
• 2. Curve Pool
• 3. iETH Rewards
• 4. Balancer Rewards
• KOVAN ENV Moved tasks to seperate issue Deploy StakingRewards on KOVAN #610
• Deploy Uniswap V2 sXAU/USDC UNI-V2 TESTNETS
• Deploy StakingRewards for sXAU/USDC exchange and SNX as rewards
• Deploy StakingRewards for iETH as staking token and SNX as rewards
• ping me and I'll configure RewardsDistribution for testing

[codecov]

Codecov Report

Merging #523 into develop will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #523      +/-   ##
===========================================
+ Coverage    99.46%   99.47%   +0.01%     
===========================================
  Files           44       45       +1     
  Lines         2792     2856      +64     
  Branches       395      403       +8     
===========================================
+ Hits          2777     2841      +64     
  Misses          15       15              

Impacted Files	Coverage Δ
contracts/RewardsDistribution.sol	100.00% <ø> (ø)
contracts/StakingRewards.sol	100.00% <100.00%> (ø)

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[jjgonecrypto]

Looks like @thekevinbrown updated Solidifier, now we just need him to publish it to npm... CoinageCrypto/solidifier#1