Refactoring Windows version
Separate Silverlight 8 and Universal App 8.1 solutions
Refactor Windows solution to MVVM for simpler WP8.1 target addition
Add support for Windows Phone 8.1
Add .gitignore file
Add top level README.md and update license
Remove unnecessary .nuget directory
Use "Real-time Filter Demo" name everywhere for consistency
Use license filename "Licence.txt" for compatibility with old links