NumberConverter supports forceDecimals, which pads extra 0s to fill out the requested number of decimal places.

- It is true by default for CurrencyConverters, since we never want to show a price like .3
Add some new properties to blueprints for NumberConverter and CurrencyConverter.
Merge pull request #1283 from asolove/number-converters-force-decimals

NumberConverter supports forceDecimals