Add the json gem for all versions of ruby, not just 1.8.x.

[postmodern]

• This was necessary to get the specs running on ruby 2.0.0p353.

[myronmarston]

I'm confused...json has been in the stdlib since 1.9. What's special about 2.0.0p353?

[JonRowe]

Indeed, and this has been running on Travis on 2.0.0 quite happily...

[postmodern]

Ah I am using Fedora ruby which apparently moved json outside of stdlib.

[JonRowe]

Ah I am using Fedora ruby which apparently moved json outside of stdlib.

... this is like the RBX fiasco alllllll over again :), I see no harm in making this change, though perhaps we should file in issue with Fedora...

[postmodern]

Actually, I just tested a vanilla version of ruby 2.0.0-p451 and bundler 1.6.2. Even those gem which json shows /opt/rubies/ruby-2.0.0-p451/lib/ruby/2.0.0/json.rb, bundler is not allowing me to require it.

Steps to Reproduce

1. echo "source 'https://rubygems.org/'" > Gemfile
2. bundle install
3. bundle console
4. require 'json'

This failed to load json under both Fedora's ruby 2.0 and vanilla ruby 2.0.

[JonRowe]

Isn't there an option for bundler that allows / disallows system gems?

[postmodern]

Oops, my mistake. Rerunning the test confirms this is Fedora's fault. I will report upstream. In the meantime, it's up to you whether you want to always use a recent version of json.