Add PyLint as a development dependency

Use `pylint calsocial` to run the static analysis.

calsocial/__init__.py

@@ -32,8 +32,6 @@ def get_locale():
     Selects the best locale based on values sent by the browser.
     """
 
-    from flask import request
-
     supported_languages = ['en', 'hu']
 
     if 'l' in request.args and request.args['l'].lower() in supported_languages:
@@ -62,7 +60,7 @@ def route(*args, **kwargs):
     ``**kwargs`` will be passed verbatim to `Flask.route()`.
     """
 
-    def decorator(func):
+    def decorator(func):  # pylint: disable=missing-docstring
         setattr(func, 'routing', (args, kwargs))
 
         return func
@@ -176,7 +174,8 @@ class CalendarSocialApp(Flask):
         form = RegistrationForm()
 
         if form.validate_on_submit():
-            # TODO: This might become False later, if we want registrations to be confirmed via E-mail
+            # TODO: This might become False later, if we want registrations to be confirmed via
+            #       e-mail
             user = User(active=True)
 
             form.populate_obj(user)