lib: update module md5 to use FFI

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib: update signals module to use FFI

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
Merge branch 'privat' into ready-for-ffi

Conflicts:
	lib/md5/md5.nit
	lib/md5/md5.nit.c
Added nit index to debugger.nit

Signed-off-by: Lucas Bajolet <r4pass@hotmail.com>
Merge remote-tracking branch 'alexis/ready-for-ffi'
Merge remote-tracking branch 'lucas/nitx_integration'
Merge remote-tracking branch 'alexis/game_framework'
Moved NitIndex redefintion from Debugger to Nitx

Signed-off-by: Lucas Bajolet <r4pass@hotmail.com>
Merge remote-tracking branch 'lucas/nitx_integration'
lib: move the `times` method to Int

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib: improves usage example of Int::times

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>