Adding ruby-rails and ruby-sinatra.

[Ben Woodcroft]

Hi all,

I am quite happy to announce that we are almost on rails. There's a new 
branch 'wip-rails' on savannah with a new file 
'gnu/packages/rails-wip.scm', which includes ~100 ruby packages towards 
rails and sinatra, both of which can be built and used, though I have 
not yet used them for anything significant.

These packages are mostly in bad shape and not ready for master. I will 
slowly get them into shape and push them over, but in the meantime I 
thought that early adopters might have a use for them, find bugs or even 
help improve them.

Hope this all helps someone out there.

ben