Add template for Fedora 19

[strzibny]

The new template for f19 handles changes in Ruby packaging [1]:

• requirement of ruby(release) instead of ruby(abi)
• usage of %gem_install macro instead of gem install command

[1] http://fedoraproject.org/wiki/PackagingDrafts/Ruby

[voxik]

Could you please split it into two commits, so I would be able to see what is the actual difference between the templates?

BTW I noticed that there is still %global rubyabi 1.9.1 and that is used later in the template. That should be probably fixed as well

[strzibny]

I am sorry, forgot about %global rubyabi 1.9.1. You can see the changes in separate commit now [1].

[1] strzibny@1102e95

[voxik]

Thank you. Since it is not mergable, I cherry-picked it and merged what was needed and released 0.8.2 gem.