Added email preferences.

This adds three email preference entries and their defaults.

Change-Id: If508e23177accb09d046b22460ebce9b9ddea5bb

setup.cfg

@@ -37,6 +37,7 @@ console_scripts =
 storyboard.plugin.worker =
     subscription = storyboard.plugin.subscription.base:Subscription
 storyboard.plugin.user_preferences =
+    email = storyboard.plugin.email.preferences:EmailPreferences
 storyboard.plugin.scheduler =
     token-cleaner = storyboard.plugin.token_cleaner.cleaner:TokenCleaner
     email-sender = storyboard.plugin.email.workers:EmailSender

storyboard/plugin/email/preferences.py

@@ -0,0 +1,34 @@
+# Copyright (c) 2015 Hewlett-Packard Development Company, L.P.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied. See the License for the specific language governing permissions and
+# limitations under the License.
+
+from storyboard.plugin.email.base import EmailPluginBase
+from storyboard.plugin.user_preferences import UserPreferencesPluginBase
+
+
+class EmailPreferences(UserPreferencesPluginBase, EmailPluginBase):
+    def get_default_preferences(self):
+        """Defines plugin preferences that may be set by the user.
+
+        Preferences are as follows: Do you want email? Would you prefer
+        individual or a digest? And if a digest, at what time of the day do
+        you want it (as seconds_past_midnight UTC)?
+
+        :return: Preferences for the email plugin.
+        """
+
+        return {
+            'plugin_email_enable': False,
+            'plugin_email_digest': False,
+            'plugin_email_digest_time': 8 * 60 * 60
+        }