First pass at Kyber contracts

[coveralls]

Pull Request Test Coverage Report for Build 293

• 85 of 96 (88.54%) changed or added relevant lines in 9 files are covered.
• 6 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+4.3%) to 55.881%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
contracts/crowdsale/CrowdsaleERC20.sol	37	40	92.5%
contracts/access/ERC20Burner.sol	29	37	78.38%
<!--	Total:	85	96	88.54%	-->

Files with Coverage Reduction	New Missed Lines	%
contracts/test/HashFunctions.sol	1	16.67%
contracts/access/ERC20Burner.sol	5	64.29%
<!--	Total:	6		-->

Totals
Change from base Build 284:	4.3%
Covered Lines:	891
Relevant Lines:	1467

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💛 - Coveralls