Issue 645

https://github.com/mastercoin-MSC/omniwallet/issues/645
Nadav, this code would impact on all transaction generations, even those that don't care about bitcoin price like Fixed Assets Issuance. I like what you did here but since it's a validation for the send page, it should be done on the WalletSendAssetsController, there is a definition for transactionGenerationController.validateForm inside the WalletSendAssetsController. I've added you to Skype so we can sync in the morning.