Jdmundrawala/11 stable bash

@adamedx @schisamo @sersut @randomcamel 
Take a look please. There will be one change (working on it after I kick off a build), and that is the repo name. It will be msys-bash.
I think you want:

```ruby
copy "#{temp_directory}/bin/#{exe}", "#{install_dir}/embedded/mingw/bin/#{exe}"
```

This ensures the version of bash that ships in the Ruby Devkit is overwritten.