Moved USB Host state machine code out from USBTask.c and into Host.c, where it more properly belongs.

Changed PIPE_CONTROLPIPE_DEFAULT_SIZE from 8 to 64 to try to prevent problems with faulty devices which do not respect the given wLength value when reading in the device descriptor.

Further documentation improvements - removed file view from the main library documentation, replaced file references in the documentation with group references.

Add new page to the documentation listing existing LUFA powered projects, fix up some inaccuracies in the documentation.