Fix for tag wrapping in Bootstrap 3

In Bootstrap 3 the label class is now 'inline' instead of 'inline-block'. As a result the tags (which are span elements) behave like words instead of DIV elements. To fix this we need to add a space between the span elements so that they are broken up as words by word wrapping. This fix does exactly that.

To reproduce the bug before this fix is applied visit http://timschlechter.github.io/bootstrap-tagsinput/examples/bootstrap3/ and input tags until they overflow out of the input box.

![wrapping bug](https://f.cloud.github.com/assets/2770206/1054502/edf9b900-1109-11e3-9956-6a305f60baa1.png)