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As the package is at early stage, it had to go through a lot of refactoring.
Hopefully, the result should be more easy to use.
Major changes:
* API completely unified
* Beginners (and intermediate) users should always go through the Model class to use the package.
* Advanced users: the documentation reference is your oyster!
* New features
* A few new graph models.
* New analysis tools: left kernel, right kernel basis change and display (for simple graphs),
injectivity/surjectivity, connected components, spanners, and vertices!
* New policies for the simulator: *priority* and *semi-greedy*!
Minor changes:
* Default rates are proportional to degree (but you can ask for 'uniform')
* We have a logo!
* Hunt for typos in documentation.
* Notebooks tutorials have been updated to cope with the new API.
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