fix(cash): sort registry amounts by number

This commit fixes a bug in the sorting algorithm of the amounts.  The
page now sorts amounts by number instead of text.

Closes #176.

client/src/partials/cash/payments/registry.js

@@ -60,7 +60,7 @@ function CashPaymentRegistryController(Cash, bhConstants, Notify, Session, uiGri
     field : 'description', displayName : 'TABLE.COLUMNS.DESCRIPTION', headerCellFilter: 'translate'
   }, {
     field : 'amount', displayName : 'TABLE.COLUMNS.AMOUNT', headerCellFilter: 'translate',
-    cellTemplate : 'partials/cash/payments/templates/amount.grid.html',
+    cellTemplate : 'partials/cash/payments/templates/amount.grid.html', type: 'number',
 
     // @TODO(jniles): This is temporary, as it doesn't take into account USD payments
     aggregationType: uiGridConstants.aggregationTypes.sum, aggregationHideLabel : true,