Replaced utils setTitle and scrollTitle by a dedicated service

- Adds a Page service that will control the page's title from anywhere.
- Adds a setTitleSong method. It takes a song as parameter, that way
  player-directive isn't responsible for correctly formatting the title. It also scrolls the title if the global setting is true
- Removes the title-related methods from utils-service

app/common/page-service_test.js

@@ -0,0 +1,54 @@
+describe("Page service", function() {
+    'use strict';
+
+    var mockGlobals, Page, utils, $interval;
+    beforeEach(function() {
+
+        mockGlobals = {
+            settings: {
+                ScrollTitle: false
+            }
+        };
+
+        module('jamstash.page', function ($provide) {
+            $provide.value('globals', mockGlobals);
+        });
+
+        inject(function (_Page_, _utils_, _$interval_) {
+            Page = _Page_;
+            utils = _utils_;
+            $interval = _$interval_;
+        });
+        spyOn(utils.toHTML, "un").and.callFake(function (arg) { return arg; });
+    });
+
+    describe("Given a song,", function() {
+        var song;
+        beforeEach(function() {
+            song = {
+                artist: 'Merlyn Nurse',
+                name: 'Exsiccator tumble'
+            };
+        });
+
+        it("it displays its artist and its name as the page's title", function() {
+            Page.setTitleSong(song);
+            expect(Page.title()).toBe('Merlyn Nurse - Exsiccator tumble');
+        });
+
+        it("if the global setting 'ScrollTitle' is true, it scrolls the page title", function() {
+            spyOn(Page, "scrollTitle");
+            mockGlobals.settings.ScrollTitle = true;
+
+            Page.setTitleSong(song);
+
+            expect(Page.scrollTitle).toHaveBeenCalled();
+        });
+    });
+
+    it("Given a title, it can scroll it", function() {
+        Page.setTitle('unbeloved omnificent supergravitate').scrollTitle();
+        $interval.flush(1201);
+        expect(Page.title()).toBe('nbeloved omnificent supergravitate u');
+    });
+});