installation: setuptools version
installation: setuptools version

* Add version requirement for setuptools in order to avoid conflicts
  with setuptools-bower
  (https://github.com/lnielsen-cern/setuptools-bower).

Signed-off-by: Adrian-Tudor Panescu <aa06e21fa1d97d8759797194b769788a4069f9b1@cern.ch>
Reviewed-by: Jiri Kuncar <2bdffcb416fed3002465740d19a053a39918cbe5@cern.ch>

inveniosoftware/invenio,tiborsimko/invenio,tiborsimko/invenio,inveniosoftware/invenio