function rejectAllocation(address _address) public onlyOwner {
    var tmp = allocationOf[_address];
    require(tmp.allocationState == Types.AllocationState.Proposed);
    allocationOf[_address].allocationState = Types.AllocationState.Rejected;
    remainingTokensPerPeriod = remainingTokensPerPeriod + tmp.tokensPerPeriod;
  }