rgbds 0.1.0 (new formula)

Game Boy assembler and linker. I do a custom install because the makefile does funky stuff with the man path that causes 'make install' to fail.

https://github.com/bentley/rgbds
```ruby
(testpath/"source.asm").write <<-EOS.undent
  SECTION "Org $100",HOME[$100]
  ...
EOS
```