Minor clean up of the Mass Storage bootloader.

git-svn-id: http://lufa-lib.googlecode.com/svn@2679 d5102386-fcda-11dd-9fdb-3debd5008f28
Add explicit requirements for the AppConfig.h headers in the various project asf.xml files, to prevent breakage with the latest ASF trunk project generator upgrades.

git-svn-id: http://lufa-lib.googlecode.com/svn@2680 d5102386-fcda-11dd-9fdb-3debd5008f28