Update getbalance_MP to allow multiple currencies
Fix getbalance_MP input conversion so int no longer needs to be supplied as a string
Merge branch 'michael-0921' of github.com:mastercoin-MSC/mastercore into michael-0921_z
Merge changes to getbalance_MP
Merge pull request #47 from zathras-crypto/michael-0921_z

Update getbalance_MP to allow multiple currencies