Fix missing docstrings on the python files.

[karlcow]

On #1473 there was a discussion about the project having missing docstrings. We didn't create docstrings for all the functions.

The output on view was.

`pep257 webcompat/views.py`
`webcompat/views.py:1 at module level:
        D100: Missing docstring in public module
webcompat/views.py:40 in public function `shutdown_session`:
        D103: Missing docstring in public function
webcompat/views.py:45 in public function `before_request`:
        D103: Missing docstring in public function
webcompat/views.py:54 in public function `after_request`:
        D103: Missing docstring in public function
webcompat/views.py:62 in public function `token_getter`:
        D103: Missing docstring in public function
webcompat/views.py:69 in public function `format_date`:
        D300: Use """triple double quotes""" (found '''-quotes)
webcompat/views.py:76 in public function `login`:
        D103: Missing docstring in public function
webcompat/views.py:87 in public function `logout`:
        D103: Missing docstring in public function
webcompat/views.py:97 in public function `authorized`:
        D103: Missing docstring in public function
webcompat/views.py:117 in public function `file_issue`:
        D300: Use """triple double quotes""" (found '''-quotes)
webcompat/views.py:127 in public function `index`:
        D300: Use """triple double quotes""" (found '''-quotes)
webcompat/views.py:150 in public function `show_issues`:
        D300: Use """triple double quotes""" (found '''-quotes)
webcompat/views.py:159 in public function `create_issue`:
        D401: First line should be in imperative mood ('Create', not 'Creates')
webcompat/views.py:208 in public function `show_issue`:
        D300: Use """triple double quotes""" (found '''-quotes)
webcompat/views.py:219 in public function `me_redirect`:
        D401: First line should be in imperative mood ('Thi', not 'This')
webcompat/views.py:219 in public function `me_redirect`:
        D300: Use """triple double quotes""" (found '''-quotes)
webcompat/views.py:228 in public function `show_user_page`:
        D400: First line should end with a period (not ':')
webcompat/views.py:228 in public function `show_user_page`:
        D300: Use """triple double quotes""" (found '''-quotes)
webcompat/views.py:250 in public function `show_rate_limit`:
        D103: Missing docstring in public function
webcompat/views.py:268 in public function `download_file`:
        D300: Use """triple double quotes""" (found '''-quotes)
webcompat/views.py:278 in public function `get_test_helper`:
        D300: Use """triple double quotes""" (found '''-quotes)
webcompat/views.py:278 in public function `get_test_helper`:
        D200: One-line docstring should fit on one line with quotes (found 2)
webcompat/views.py:286 in public function `about`:
        D300: Use """triple double quotes""" (found '''-quotes)
webcompat/views.py:294 in public function `privacy`:
        D300: Use """triple double quotes""" (found '''-quotes)
webcompat/views.py:302 in public function `contributors`:
        D300: Use """triple double quotes""" (found '''-quotes)
webcompat/views.py:310 in public function `cssfixme`:
        D400: First line should end with a period (not 'l')
webcompat/views.py:310 in public function `cssfixme`:
        D300: Use """triple double quotes""" (found '''-quotes)
webcompat/views.py:316 in public function `log_csp_report`:
        D300: Use """triple double quotes""" (found '''-quotes)
`

There are a couple of recurring issues.

• missing docstrings
• Imperative style
• length
• quote styles