Build Dutch Auction Crowdsale Library

[joshuahannan]

What is it?

We need a library for a Dutch Auction Crowdsale

Problem

We need to flesh out our library of crowdsale models, and a dutch auction library similar to Gnosis or Raiden's models would be good to have.
https://github.com/raiden-network/raiden-token

Solution

Research how dutch auction token sales function and build a library that utilizes the base CrowdsaleLib.sol so achieve dutch auction functionality

Steps to implement

1. Research previous implementations of dutch auction crowdsales
2. Write spec for DutchAuctionCrowdsale.sol including storage structs.
3. Translate spec into library code, following formatting similar to other Modular libraries
4. extensively document and test the implementations
5. Build README documenting the functionality similar to other library READMEs