Add Tests for AzureMobile and LocalItemsFile DataServices
Add Unit Tests for Services
Add RemoteAppSettingsTest
Update YoutubeServiceTest.cs

Add Public API key
Modify RssServiceTest
Update ItemsShowcaseViewModel and RemoteAppSettingsTest
Merge pull request #51 from thuyphuong9000/UnitTests

Update YoutubeServiceTest.cs
Merge pull request #52 from stevob14/UnitTests

Modify RssServiceTest
Merge pull request #53 from gacheson/UnitTests

Update ItemsShowcaseViewModel and RemoteAppSettingsTest
Add Twitter test Keys
Merge pull request #54 from jbatman/UnitTests

Add Twitter test Keys
Merge pull request #55 from winappkits/UnitTests

Unit tests