code wasn't rounding the amounts properly for mass transfer transactions
Adds unit tests for the walletService (only the massTransfer method for now, more will come in separate PRs)
removed mocks folder/file and renamed to spies, implementing a better way to provide test files with Jasmine spies (via a createServiceSpy() method that can be called as a provider for the test file)
walletService(only themassTransfermethod for now, more will come in separate PRs)mocksfolder/file and renamed tospies, implementing a better way to provide test files with Jasmine spies (via acreateServiceSpy()method that can be called as a provider for the test file)closes #195