First try to resyntax

I am just novice for this gem, and want to resyntax it first. What I mean is there is a lot of ruby-style-guides, I prefer the most popular: [https://github.com/bbatsov/ruby-style-guide](ruby-style-guide) and there is gem for checking appropriate ruby style: [https://github.com/bbatsov/rubocop](rubocop).

So, I ran this gem and saw a huge amount of offences and repaired a little part of ruby 'bad' style.

Just try to go to the root of the_comments, then `gem install rubocop` and then run `rubocop`

Another thing I made is adding ruby 2.0v to .travis.yml