option keepTitle

I've added another option to the dropdown creation, that allows the user to decide if the dropdown shoul replace the title or if it should show both, title and dropdown side by side.

Example:
```javascript
var dropdown = abx.createDropdown({
    titles: ["First", "Second", "Third"],
    keepTitle: true
});
```
![screenshot_2014-09-11-10-52-23 2](https://cloud.githubusercontent.com/assets/2563642/4231645/bab63c40-3993-11e4-81e1-01d12b34683a.jpg)