Added support for storing programs in a subfolder

Added support for storing apps in a separate folder.
Merge branch 'master' of https://github.com/Larsjep/monoev3

Conflicts:
	MonoBrickFirmware/MonoBrickFirmware.csproj
Removed build warnings
Added small arrow in select dialog
XamarinStudio/MonoDevlop Addin for Lego Mindstorms EV3 - initial commit
Add the Addin project to main solution