Minor documentation improvements.

git-svn-id: http://lufa-lib.googlecode.com/svn/trunk@2635 d5102386-fcda-11dd-9fdb-3debd5008f28
Add missing module dependency to the USBtoSerial project. Minor documentation corrections.

git-svn-id: http://lufa-lib.googlecode.com/svn/trunk@2636 d5102386-fcda-11dd-9fdb-3debd5008f28
Fix "grep: Version.h: No such file or directory" error when including the core LUFA library makefile in a legacy makefile.

git-svn-id: http://lufa-lib.googlecode.com/svn/trunk@2637 d5102386-fcda-11dd-9fdb-3debd5008f28