ability to reuse EOS key and MetaMask REJECT exception

[alexpmorris]

I figure it's being done this way to avoid people mis-entering their public/private EOS Token Sale Claim Keys (and possibly due to the implementation as well), but it would be nice if we could reuse and add to a particular address instead of having a separate Claim Key for each spend (or at least for multiple spends in the same day).

Also, "Your EOS" on the UI is a really nice addition as well (pretty sure it wasn't there yesterday, though if it was I hadn't noticed it).

Finally, at least for MetaMask users, it seems to pop up with a 0 ETH transaction, and always asks for 20 gas price (max transaction fee = 7 USD) which can be lowered to 2 (max = 71 cents USD). When I REJECT it, the UI pops up this exception:

Error: Error: MetaMask Tx Signature: User denied transaction signature.
at TransactionController. (chrome-extension://nkbihfbeogaeaoehlefnkodbefgpgknn/scripts/background.js:4350:25)
at TransactionController.g (chrome-extension://nkbihfbeogaeaoehlefnkodbefgpgknn/scripts/background.js:42698:16)
at TransactionController.EventEmitter.emit (chrome-extension://nkbihfbeogaeaoehlefnkodbefgpgknn/scripts/background.js:42614:17)
at TransactionController._setTxStatus (chrome-extension://nkbihfbeogaeaoehlefnkodbefgpgknn/scripts/background.js:1555:14)
at TransactionController.setTxStatusRejected (chrome-extension://nkbihfbeogaeaoehlefnkodbefgpgknn/scripts/background.js:1444:12)
at TransactionController.cancelTransaction (chrome-extension://nkbihfbeogaeaoehlefnkodbefgpgknn/scripts/background.js:1313:12)
at Proto.apply (chrome-extension://nkbihfbeogaeaoehlefnkodbefgpgknn/scripts/background.js:33833:13)
at Proto.handle (chrome-extension://nkbihfbeogaeaoehlefnkodbefgpgknn/scripts/background.js:33809:19)
at dnode.handle (chrome-extension://nkbihfbeogaeaoehlefnkodbefgpgknn/scripts/background.js:34088:21)
at dnode.write (chrome-extension://nkbihfbeogaeaoehlefnkodbefgpgknn/scripts/background.js:34076:22)
at Object.InvalidResponse (chrome-extension://nkbihfbeogaeaoehlefnkodbefgpgknn/scripts/inpage.js:7861:27885)
at chrome-extension://nkbihfbeogaeaoehlefnkodbefgpgknn/scripts/inpage.js:7862:26989
at chrome-extension://nkbihfbeogaeaoehlefnkodbefgpgknn/scripts/inpage.js:168:7
at chrome-extension://nkbihfbeogaeaoehlefnkodbefgpgknn/scripts/inpage.js:7838:5

I have a feeling that may be outside the scope of the contract's UI to capture the exception since it's coming from a chrome plugin, but figured I'd at least bring it up anyway.