[LiskHQ/lisk] Solutions to improve Lisk DPoS (#353)

DPOS has many drawbacks, for example, if a witness node was controlled by a attacker, then the attacker can broadcast many conflicting block with the same block height, in such condition, the 101 witness network would be split to many sub-network which are not compatible with each other, at this moment,
if the confirmations of these conflicting blocks is less than 2 / 3 of total num of witness, then the whole network would be suspended. you might say that if can not reach 2 / 3, the system has a timeout mechanism, but wait, if system allow one witness produce two height within a small interval, then different witness would generate different LIB (last irreversible block).

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