Add pretty-mode-plus.

Redisplay parts of the buffer as pretty symbols.

I'm the former maintainer and now contributor, @akatov is the current maintainer.

https://github.com/akatov/pretty-mode-plus

https://github.com/akatov/pretty-mode-plus/issues/20

Tested 'make recipes/<recipe>' and did a package-install-file on it. It had previously lived on Marmalade successfully.