Update of install docs

[colindaven]

Hi, just started here.
I think there are a couple of errors in the install docs

First, to build ABruijn, run:

python install.py build
I used
python setup.py build

ABruijn could be invoked with the following command:

bin/abruijn
This then worked, I haven't tested out the full algorithm with test or my data yet though

Additonally, you may install the package for the better OS integration:

python setup.pu install

Correction
python setup.py install

[mikolmogorov]

Thank you for catching this! It's fixed now.