new pivot table presentation 'spectrum' breakdown

as contribution to the tasks named in
https://docs.google.com/document/d/1_yTlmn4eeMnLFZZ57R8jbejo3ISIcipBZgHZord_dQ4/edit
renders a combined half donut chart for one axis and a barchart for the other
![spectrum1](https://cloud.githubusercontent.com/assets/6653836/4532450/1f7213a8-4d93-11e4-85b3-a86833c0b402.png)
clicking on a section of the donut or selecting from the series menu filters the barchart to this series
![spectrum3](https://cloud.githubusercontent.com/assets/6653836/4532479/5173f498-4d93-11e4-9e33-99792748b934.png)
![spectrum4](https://cloud.githubusercontent.com/assets/6653836/4532483/591cb00e-4d93-11e4-8bb4-332d59ee57c1.png)
hovering tooltips included, chart explore function for the barchart still a Todo (but working on it)
![spectrum5](https://cloud.githubusercontent.com/assets/6653836/4532501/85e56766-4d93-11e4-9136-0cfd04b95c2f.png)