Restructure our python module. A lot.

src/pretix/plugins/timerestriction/__init__.py

@@ -0,0 +1,22 @@
+from django.apps import AppConfig
+from django.utils.translation import ugettext_lazy as _
+from pretix.base.plugins import PluginType
+
+
+class TimeRestrictionApp(AppConfig):
+    name = 'pretix.plugins.timerestriction'
+    verbose_name = _("Time restriction")
+
+    class PretixPluginMeta:
+        type = PluginType.RESTRICTION
+        name = _("Restriction by time")
+        author = _("the pretix team")
+        version = '1.0.0'
+        description = _("This plugin adds the possibility to restrict the sale " +
+                        "of a given item or variation to a certain timeframe " +
+                        "or change its price during a certain period.")
+
+    def ready(self):
+        from . import signals  # NOQA
+
+default_app_config = 'pretix.plugins.timerestriction.TimeRestrictionApp'