Use pip install in test

[fdiblen]

test_install checks installation problems of the generated package. It uses setup.py instead of pip which is not same of what is described in the documentation. We should use pip instead.

python-template/tests/test_project.py

Line 43 in 419c4cc

sh.python(['setup.py', 'install'])

[sverhoeven]

Fixed in PR #185. In PR #185 a new test was written that uses pip