Fix testproject/manage.py to be executable

testproject/manage.py could not be run as ./manage.py because
shebang was not the first line. Thus, the import commands raised
errors. Obviously, "python manage.py" worked but now even short
"./manage.py" works.
Merge pull request #325 from jluttine/fix-testproject-manage

Fix hashbang in testproject/manage.py