Rename .gitignore file.
Updated .gitignore to include backup files.
Added Atmel ATmegaxx4 generic variant.  Currently contains boards for only '644PA and '1284P.
Added Wattage board variants. Boards.txt file only, based on atmegaxx4-generic.
Added Wiring board variants.  Also contains specific variant for Wiring S Play Shield (which has a non standard pin layout compared to atmegaxx4-generic).
Added Rogue Robotics Boards. Contains a board variant which is non-generic, but can be used as a template for others to maintain compatibility with ATmega328PA variants.
Added LittleRobotFriends board.txt.