newRPL - build 1255 released! [updated to 1299]

[Claudio L.]

Heads up! I updated the unofficial roms to build 1016 for all 3 targets (see first post).

I also added a section to the wiki to update your source tree and rebuild, for people building their own simulator/firmware.

I recommend updating to the latest ROM, since it has some bugfixes that should improve stability.

I also removed the requirement of the '.nrpl' and '.nrpb' extensions. I recommend the use at least for backup objects, but it's now entirely optional.