Selection rendering

New rendering for selection: a filled rect over area rects.
- Border 1px solid (no longer dashed), black (#000) with opacity 10% (transparency 90%).
- Background (fill color), black (#000) with opacity 18%.

![sel](https://cloud.githubusercontent.com/assets/166062/4233899/3069e1c2-39b1-11e4-9ab1-44ae01a14f84.png)