Add Arduino add-ons for Arduino 1.5

The existing Arduino_1.x.x add-on directory was renamed to Arduino_1.0.x. The U8glib library and the bootloaders included in the add-ons for Arduino 1.5 are identical to the versions provided with the add-ons for Arduino 1.0.

I have tested this with a RAMBo board, and it works correctly. I don't have a Sanguino board to test with, but that should work as well.