Added link to HydraBus/HydraNFC git
Merge pull request #3 from biot/master

New console system + small doc fix
Fix typo from microrl_config.h and update towards latest microrl
Removed build directory hydrafw.dfu & hydrafw.hex will be included only in release as separate archive in future.
Cleanup code con->bss to chp for clarity.
Removed hard_fault.c it was not used.
Fixed microsd command cmd_sd_ls (fully rewritten).
Added microsd commands: cmd_sd_read_perfo, cmd_sd_cd, cmd_sd_pwd for HydraBus & HydraNFC.
Added microsd command hd to HydraNFC.
Fix HydraNFC help with new commands.
Added sd_rperfo command in help.
Removed "ch_test" from help it does not exist anymore.