Simplify Makers Interactions with Staking Pools.

- No longer an upper limit on how many makers can be in a pool.
- No longer a handshake for a maker to join a pool.
- No longer any special powers given to makers.
- Pool Id starts at 1 and increments by 1.

contracts/staking/test/unit_tests/protocol_fees_test.ts

@@ -183,6 +183,7 @@ blockchainTests('Protocol Fees unit tests', env => {
                     DEFAULT_PROTOCOL_FEE_PAID,
                     { from: exchangeAddress, value: DEFAULT_PROTOCOL_FEE_PAID },
                 );
+
                 assertNoWETHTransferLogs(receipt.logs);
                 const poolFees = await getProtocolFeesAsync(poolId);
                 expect(poolFees).to.bignumber.eq(DEFAULT_PROTOCOL_FEE_PAID);