Made locale reactive and resistant against page reloads

Hey,
i updated a couple of lines in order to do the following things:
- made locale reactive

```javascript
Template.hello.events({
	'change select': function (event) {
		var locale = event.currentTarget.value;
		if (locale) {
			Meteor.setLocale(event.currentTarget.value);
		}
	}
});
```
- added a public getter

```javascript
Meteor.getLocale();
```
- made current locale resistant against page reloads

check it out!