fixing some minor bugs introduced in the last refactoring. fixing a lot of jslint errors
changing a few parameters:
- `symbol` ~> `prefix`
- `symbolStay` ~> `affixesStay`
- `symbolPosition` no longer exists and to put the symbol at the right, you should use `suffix`
- `affixesStay` is now default to `true`

related #56
updating minified file to 2.9