LibraryView styling as for Demo

# Before
![image](https://cloud.githubusercontent.com/assets/8158404/4009870/fc02e36e-29ea-11e4-977b-d0fa641239d1.png)

# After
![image](https://cloud.githubusercontent.com/assets/8158404/4009871/02955cac-29eb-11e4-89c3-5a1ff8a99b0a.png)

# Solution
I have added different colors, alignments, fonts. Maybe, they are not completely the same as they have to be, because it's not written yet in specification exactly which I should use. However, it's not hard to change colors. Also pay attention to property `Focusable`, that was declared in `BrowserItem`. It's used to make StandardPanel not focusable and at the same time give ability to class buttons be click-able.
The following ```Binding``` expression is quite long, it should be taken out into ```<Binding>``` tag by itself:

```xml
<controls:LibraryWrapPanel.Width>
    <Binding Path="ActualWidth"
             ElementName="CategoryListView" />
</controls:LibraryWrapPanel.Width>
```