Minor documentation improvements. Remove AS4 project generator script as it is buggy; replace with a better system in the future for both AS4 and AS6.

Fixed incorrect Dataflash functionality in the USBKEY board if the driver is modified for a single Dataflash chip (thanks to Jonathan Oakley).

Fix missing briefs in the documentation for several modules, fix up invalid documentation references.

Fixed lengthy timeouts in the USBtoSerial project if no application on the host is consuming data (thanks to Nicolas Saugnier).

Fixed lengthy automatic data flushing in the CDC and MIDI device class drivers.

Add error message for debugging purposes to the low level AudioInputHost and AudioOutputHost demos, if the request to set the audio sample rate fails.

Fixed possible rounding in the VERSION_BCD() macros for some 0.01 step increments (thanks to Oliver Zander).

Fixed logic hole breaking USB operations on a USB controller with only one supported USB mode and no USB_DEVICE_ONLY or USB_HOST_ONLY configuration token set.

Added new doxygen_upgrade and doxygen_create targets to the DOXYGEN build system module. Clean up CORE build system module.

Document build system targets. Add a rule to the BUILD module that is run if a source file does not exist to show an error to the user, rather than running the check-source rule before each build (slightly faster/more portable and the generated error is then a true make error).

Fixed missing Win-32bit compatibility sections in the LUFA INF driver files (thanks to Christan Beharrell).

Upgrade Doxygen configuration files, custom style CSS and DOXYGEN build module for the latest Doxygen release.

Fixed inverted LED driving code for the Arduino Leonardo board. Fixed inverted LEDs_GetLEDs() function implementation for the Benito, Minimus and Arduino UNO boards.

Added support for the Arduino Leonardo board. Swap Olimex 32U4 RX/TX LED masks so that it lines up with the Arduino boards.

Added workaround for broken VBUS detection on AVR8 devices when a bootloader starts the application via a software jump without first turning off the OTG pad (thanks to Simon Inns)

Fix broken code sample section spacing in the Doxygen documentation due to a missing line-height CSS property.

Fixed endianess issues in the RNDIS host class driver for UC3 devices (thanks to Andrew Chu). Fix broken build for UC3 devices when ORDERED_EP_CONFIG compile time option is set.

Add DEBUG_FORMAT and DEBUG_LEVEL optional parameters to the BUILD module. Turn off generation of debug information when performing a validation build, and when running the build tests.

Rename build system module makefiles from "lufa.MODULE.in" to "lufa_MODULE.mk" to prevent makefile from assuming the include is an old style build rule, slowing down the build process.

Prevent the BUILD module from shell-executing multiple processes to determine the avr-size flags to speed up the build, unless the size rule is invoked.

Add warnings and set warnings as errors to the SingleUSBModeTest build test makefile.

Rename hid-teensy and hid-teensy-ee targets to teensy and teensy-ee to be in line with the DFU module target names.

Fix up makefile .NOTPARALLEL heuristics so that linear building is only enforced if no object folder set and the "all" target is run. Rename library "ConfigDescriptor.c" file to "ConfigDescriptors.c" to ensure that object filenames are unique.

Update BUILD build system module with OBJECT_FILES variable, for additional user-specified object files. Update HID build module with a small shim application to reprogram the EEPROM of a target.