Merge pull request #241 from SciLifeLab/develop

Develop
No need for pre-cleaning now. More heap space for the JVM
Merge branch 'hotfix/new-workers-adaptation' into develop
Create virtualenv so dependencies doesn't colide with existent software
Workon master before installing!
Install numpy and cython through repositories (fastar, because they're precompiled)
Added site packages when creating virtualenv
No virtualenv... just remove paramiko and let pip install it
Python-dev to build numpy and cython
numpy and cython have to be compiled, so they have to be installed independently
And uninstall paramiko!
Let the .travis.yml be as it was before failiing
Without paramiko
Create virtualenv previously erasing paramiko and using system packages
Workon master after installing
Step by step, and do not call workon, it is suposed to be called when you create the virtualenv
No virtualenv, python-dev installed
Sudo if no virtualenv!
Travis seems to create a virtualenv, so no sudo should be required. And this could be the source of the ImportError problem
Install pysam 0.7, wich is compatible with distutils 0.6.31