printDatawraps fails when using setup.py install

[feghalya]

The directory containing pyGeno's datawraps (bootstrap_data) doesn't get copied automatically when installing with 'python setup.py install' (in opposition to 'develop') or when installing with pip.

[tariqdaouda]

The boostrap module is a legacy submodule. We should probably remove it and have datawraps hosted remotely (ex: on github). Something that was less convenient to do when pyGeno started. That would make the distribution lighter and would allow for a larger number of datawraps.