Fixes wrong option for extras_require and cleanup.

setup.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 
-from setuptools import setup, find_packages
+from setuptools import setup
 
 VERSION = '0.7.0'
 
@@ -13,17 +13,19 @@ setup(
     url='https://github.com/pubs/pubs',
 
     description='command-line scientific bibliography manager',
-    packages     = ['pubs', 'pubs.config',
+    packages=['pubs',
+              'pubs.config',
               'pubs.commands',
               'pubs.templates',
-                            'pubs.plugs', 'pubs.plugs.alias'],
+              'pubs.plugs',
+              'pubs.plugs.alias'],
     scripts=['pubs/pubs'],
 
     install_requires=['pyyaml', 'bibtexparser', 'python-dateutil', 'requests',
                       'configobj',
                       'beautifulsoup4'],  # to be made optional?
     tests_require=['pyfakefs>=2.7'],
-    extra_require = {'autocompletion': ['argcomplete'],
+    extras_require={'autocompletion': ['argcomplete'],
                     },
 
     classifiers=[