Add xprintf(xitoa) from elm-chan.org
Use dprint and dprintf for debug
Merge branch 'fix_print'
Fix makefile, debug print and keymap of HHKB
Fix command.c and README
Fix deprecated 'prog_*' typedef - Issue #34

- Remove prog_char from xpritnf
- Remove prog_macro_t from acton_macro

avr-libc-1.8 removed 'prog_*' typedef because the usage of
the __progmem__ attribute on a type is not supported in GCC.
http://www.nongnu.org/avr-libc/changes-1.8.html
Fix keymap of hid_liber from yeeeargh