Getting ready for return to rubygems hosting

@marcel12bell, @joannecheng, @kaligrify, @codebeige, @gravitystorm, @tsuga, @nick-holloway, @jdan, @picodegallo, @tsuga, @jashkenas, @moumar, @97-109-107, @untemperedschism, @fjenett. I am proposing to merge this development branch into ruby-processing. You have either contributed to, or expressed a recent interest in ruby-processing. Please try out this version (if the changes are likely to affect you) as the changes are fairly major.