Added Count to Opacity converter and added null checking to StringToImageBrushConverter.

Also finished Music Pages
Added Count to Opacity converter and added null checking to StringToImageBrushConverter.

Also finished Music Pages
Merge branch 'master' of https://github.com/gabrielsadaka/XBMCRemoteRT.git
Merge pull request #18 from gabrielsadaka/master

Added Count to Opacity converter and added null checking to StringToImageBrushConverter.  Also finished Music Pages