Submitting solutions to learn_ruby as well as updates to RSpec files.

Hello,

I just went through and completed all 15 exercises for learn_ruby. Along with that I also included modifications to the RSpec files so that it works w V3.1's standards. I'm initiating a pull request to see if you think this work would be helpful to provide to others that want to use the newer version of RSpec to test. Can you please review? This is my first time doing a pull request on GitHub so feedback is certainly welcome. Also feel free to include this work on the Student Solutions sections on http://www.theodinproject.com/web-development-101/ruby?ref=lc-pb as well if that helps.

Thanks!

- Coy