Don't install development scripts.

--- qutebrowser-0.2.1/setup.py
+++ qutebrowser-0.2.1/setup.py
@@ -38,7 +38,7 @@
 try:
     common.write_git_file()
     setuptools.setup(
-        packages=setuptools.find_packages(exclude=['qutebrowser.test']),
+        packages=setuptools.find_packages(exclude=['qutebrowser.test', 'scripts']),
         include_package_data=True,
         entry_points={'gui_scripts':
                       ['qutebrowser = qutebrowser.qutebrowser:main']},