Start Notifications component refactor

Factor some things out of the mega Notifications component, and add a dummy
unit test to show willing

src/notifications/PushRuleVectorState.js

@@ -0,0 +1,78 @@
+/*
+Copyright 2016 OpenMarket Ltd
+
+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.
+*/
+
+'use strict';
+
+/**
+ * Enum for state of a push rule as defined by the Vector UI.
+ * @readonly
+ * @enum {string}
+ */
+module.exports = {
+    /** The push rule is disabled */
+    OFF: "off",
+
+    /** The user will receive push notification for this rule */
+    ON: "on",
+
+    /** The user will receive push notification for this rule with sound and
+        highlight if this is legitimate */
+    LOUD: "loud",
+
+    /**
+     * Convert a PushRuleVectorState to a list of actions
+     *
+     * @return [object] list of push-rule actions
+     */
+    actionsFor: function(pushRuleVectorState) {
+        if (pushRuleVectorState === this.ON) {
+            return ACTION_NOTIFY;
+        }
+        else if (pushRuleVectorState === this.LOUD) {
+            return ACTION_HIGHLIGHT_DEFAULT_SOUND;
+        }
+    },
+
+    /**
+     * Convert a pushrule's actions to a PushRuleVectorState.
+     *
+     * Determines whether a content rule is in the PushRuleVectorState.ON
+     * category or in PushRuleVectorState.LOUD, regardless of its enabled
+     * state. Returns undefined if it does not match these categories.
+     */
+    contentRuleVectorStateKind: function(rule) {
+        var stateKind;
+
+        // Count tweaks to determine if it is a ON or LOUD rule
+        var tweaks = 0;
+        for (var j in rule.actions) {
+            var action = rule.actions[j];
+            if (action.set_tweak === 'sound' ||
+                (action.set_tweak === 'highlight' && action.value)) {
+                tweaks++;
+            }
+        }
+        switch (tweaks) {
+            case 0:
+                stateKind = this.ON;
+                break;
+            case 2:
+                stateKind = this.LOUD;
+                break;
+        }
+        return stateKind;
+    },
+};