Create a development and a production build

There are a lot of checks all over the place for example :

```javascript
validateParameterPresence( unit, "unit" );
validateParameterTypeString( unit, "unit" );
```

Are they useful in production ?

In the source code of React, there are a lot of checks but they are enabled only in development mode :

For example : https://github.com/facebook/react/blob/master/packages/react-dom/src/client/ReactDOM.js#L1053-L1055

And they change this variable when building : https://github.com/facebook/react/blob/master/scripts/rollup/build.js#L234
They even have babel plugins to automatically wrap some functions with this `if (__DEV__) {}` condition : https://github.com/facebook/react/blob/master/scripts/rollup/build.js#L88-L91

This could have two advantages :
* The size of the final bundle would be smaller
* The performance would be better by not running those checks

Is it possible to have something similar in Globalize ?

If yes, I'm willing to do a POC Pull Request

__Edit :__
I know there is a runtime version already, but not everybody can use the production generator to be able to use only the Globalize Runtime, Anyway, these changes would also benefit the runtime version