ODE Documentation

[tBuLi]

The ODE branch is almost finished. Now it needs to have some good documentation. Any nice toy models to serve as examples are welcome.

I will also include a list of thing that need to be done on the ODEModel for reference:

• Higher order ODEs, currently only systems of 1st order are allowed
• Check the standard deviations in parameters against analytical solutions for some model systems. They appear to be unrealistically high.
• Initial conditions should be allowed to be Parameter objects as well because the Fit seems to be very sensitive to getting them exactly right.

I wanted to have all these finished before releasing but I now realize that its better to release the functionality we have now so people can start using it already.

[tBuLi]

The basic ODE branch has now been merged into master because the basic functionality is there, now lets get feedback from actual use cases.

All of the above points still have to be addressed however. Point 2 should be a simple check, the other two are far more fundamental.

edit: basic Docs have been provided.