Advanced Claim Option

At the moment of period 44, `claimAll` costs around $10 since it iterates all days from zero to the present. While $10 is quite big, it is even expected to grow in the future and `claimAll` become lest cost-efficient method.

With disclaimer of "You should know what period you invested" thing, `claim` option can abate this problem. Currently claiming a single period costs around $0.4 or less (e.g. $0.022 https://steemit.com/kr/@twinbraid/hmwx2-eos-ico) which is 25 times or more efficient than `claimAll`.

Metamask UI should have an advanced claim option to enable users to access `claim` option, while MEW can do it now. Other off-chain tool can support this method by identifying specific periods a user invested.