Cleanup dependencies, add gemnasium dependency monitoring

@zbruhnke, I have problems every time I want to do some work on bloggy, so this pull request addresses some of the issues. Please review this one carefully based on my comments.

There seemed to be a lot of unused dependencies. cucumber, shoulda, gems to support those. There aren't really any tests for bloggy, and they certainly weren't using cucumber, so I've dropped a bunch of stuff. Please verify my assessment in your environment because my choices could be wrong.

I've added ```.ruby-version``` ```.ruby-gemset,``` and ```Gemfile.lock```. I still use ```rvm``` but believe the ```.ruby-```s work with other version tools.

I've bumped the version numbers for everything up to current versions with the pessimistic operator except redcarpet. jekyll itself doesn't yet work with the latest version, so that's not our fault.

I've added gemnasium monitoring because I think it's useful, plus it gives us a (stinking) badge for the README.md, and all the cool kids have badges. See my repo to see this in action. Click through on the badge to see what gemnasium gives us.

I'm working on another regression, but I'm basing that work on this branch because it's too hard to work from your master. Would like to see bloggy get some real tests so we can all have a little more confidence. I can't get behind a 1.0 release without some toothy tests.