GetBalance account has to be "lowercase"

[mickys]

We should be able to pass addresses in any uppercase / lowercase / checksummed format.
Currently it only accepts lowercase addresses.

Available Accounts
=============================
(0) 17f343a7a13bac8026d6c84e2ee2925aeba1fa61 (Amt: 100000) (Nonce: 0)

call:

{ jsonrpc: '2.0', method: 'GetBalance', params: [ '17F343A7A13BAC8026D6C84E2EE2925AEBA1FA61' ],  id: 1 }

result:

{ id: 1, jsonrpc: '2.0', result: { balance: 0, nonce: 0 } }

EXPECTED result:

{ id: 1, jsonrpc: '2.0', result: { balance: 100000, nonce: 0 } }