Tab Control implementation and necessary UI restyling

Tab Control:
![image](https://f.cloud.github.com/assets/4847382/1396191/6a38681e-3c56-11e3-84c1-be3b3627c66a.png)
- Tab sliding window
- Tab auto resizing
- Tab control menu:
![image](https://f.cloud.github.com/assets/4847382/1396195/9d6aca6a-3c56-11e3-8684-ac4a4a1b8664.png)

- Sliding window expansion on screen expansion

UI Styling:
- Restyled tabs
- Restyled library for consistency

![image](https://f.cloud.github.com/assets/4847382/1396196/a4785336-3c56-11e3-8707-d6d334a87eea.png)