Incorrect results for multivariate testing

With multivariate testing the result should also be stored by combination of group and options.

Let me explain with an example:

Group 1:
Option 1: Yellow
Option 2: Blue

Group 2:
Option 1: Right
Option 2: Left

So we have 4 possible options here. The result should be stored for each combination of groups and options.

1) Left Blue
2) Left Yellow
3) Right Blue
4) Right Yellow

For the moment the module only track the options individually.