Update pptx

Add Instructions on removing extraneous columns now added by default,
see:
http://blogs.msdn.com/b/carlosfigueira/archive/2013/11/23/new-tables-in-azure-mobile-services-string-id-system-properties-and-optimistic-concurrency.aspx
Updated README - App Builder Tutorial

Added a link to the XPCK App Builder tutorial to the README.
Add Opacity to WallPaper Background

Due to ability of user to set Light / Dark theme on Windows Phone, text
may not be visible unless opacity is applied.
Allow title text to wrap
updated ignore for .DotSettings
Merge pull request #32 from mikescott8/master

updated ignore for .DotSettings
Fallback to logo when image not found in RSS item
Merge branch 'master' of https://github.com/winappkits/XPlatformCloudKit
Add Youtube Author example
Merge pull request #34 from acrow59/master

Updated README - App Builder Tutorial
Merge branch 'master' of https://github.com/mikescott8/XPlatformCloudKit into Start_OPML_remote_support