Add Vector Plots

![test18_from_diagrams_svg](https://cloud.githubusercontent.com/assets/2905226/4024993/3f8a3e20-2be4-11e4-9eb4-23b8ebd79b62.png)

Hello,

In this pull request:
- VectorStyle is now in 'Default' class.
- Added a test case (Abyss).

Thanks,
Anton