Update Installation Instructions

[kiddyboots216]

The latest version on PyPi is pretty outdated, so the pip install is going to leave folks with issues that have since been fixed in the code.

We should either update the PyPi version (i.e. do a v0.3 release) or if development is ongoing, update the install instructions to use `python setup.py install'.

[Algue-Rythme]

I agree, is there any news on a future release?

The code has changed a lot since the last one.

[jeremy43]

Sorry for the delay. we are working on the new release (making it consistent with the Pypi version & fixing some numerical issues). We will make a new release in September.

[Algue-Rythme]

Thats's great news! Thank you.