Accepts ERC-67 with a malformed URL

[ligi]

Follow up from #4 :
I think the problem of the user came from a malformed URL as tests showed that parsing ERC-67 that contains gas works
I could reproduce the problem with a malformed URL that looks like this:
ethereum:0xabc?value=100000000?gas=2030000000000000000

then in WALLETH the gas-value from is taken as value as described here:
https://www.reddit.com/r/ethereum/comments/78wj3s/erc67_support_by_ethereum_wallet_providers_so/

Fix is to detect ERC-67 as invalid when gas or value are not plain numbers

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