improved app detail markup.

related to #34.
improved the log template markup.

related to #34.
improved app teams markup.

Related to #34.
improved add team template.

related to #34.
fixed logout button.

related to #34.
implemented sidebar.

related to #34.
pep8 rules in urls.py.
applying pep8 rules in app/views.
applying pep8 rules in auth/views.
removed identation by tabs.
removed unused imports.
pep8: app/forms.
applied pep8 for apps/tests/test_app_add_team_view.
fixed tests.