Move IIFE snippet to before if/else snippet.

If you type `iife<tab>`, the `ife` snippet takes precedence because it is first in the file. So the result ends up:

```js
iif (true) {
	
} else {
	
}
```

Instead of the expected IIFE.
Merge pull request #28 from postcasio/patch-1

Move IIFE snippet to before if/else snippet.