Add a specific minimum ruby version to the spec
Resolve merge conflict in json-schema.gemspec
Add 1.8 to travis
Revert "Add 1.8 to travis"

This reverts commit 9ff2f5067a798e0a6da18526f0965f5515456d94.
Merge pull request #149 from hoxworth/gemspec-ruby-version

Add 1.8.7 minimum ruby version to the spec