On last step - replace 'Next' with 'Done' and hide the 'skip' button

Here's a screenshot of how it will look like:
![done](https://f.cloud.github.com/assets/639935/696321/ac151174-dce3-11e2-8635-8e615ed67c1e.png)

For me it makes much more sense to hide the 'Next' and 'Skip' buttons and show only the 'Done' button