Ensure the demo and project main text files are distributed in Atmel Studio projects.

Demos/Device/ClassDriver/MassStorage/asf.xml

@@ -19,6 +19,8 @@
 		<device-support-alias value="lufa_xmega"/>
 		<device-support-alias value="lufa_uc3"/>
 
+		<build type="distribute" subtype="user-file" value="MassStorage.txt"/>
+
 		<build type="c-source" value="MassStorage.c"/>
 		<build type="c-source" value="Descriptors.c"/>
 		<build type="c-source" value="Lib/DataflashManager.c"/>